Billy Shuibi Bio 100 Strauss 11 May 2016 Heart The heart is one of the most unique organs in the human body. Its capabilities and functions truly are amazing. The heart 's function is to pump blood throughout the body supplying oxygen and nutrients to tissues. The heart is the size of your fist and weighs roughly 8-12 ounces depending if you’re male or female. The heart pumps through 100 kilometers of blood vessels for blood that is 3 to 4 times thicker than water at 60 to 80 times minute for a total volume of 5 million liters a year at rest. A basic diagram of the heart includes, right coronary, superior vena cava, aorta, pulmonary artery, pulmonary vein, right atrium, right ventricle, left atrium, left ventricle. There are more in …show more content…
The ventricles send blood to the heart and are larger and stronger. Heart valves are another important aspect of the heart and body. We have atrioventricular and semilunar valves which help block regurgitation of blood. The heart has two states, it has a systole state where the heart is contracting to push blood out and diastole where the heart relaxes so the heart can fill back up with blood. Anatomy of the heart consists of the Atria, which is a collection of blood and not much pump force, Auricle which is attached to the atria to increase potential volume filling, Ventricles have thought myocardium and do the majority of pumping blood, Exterior is the coronary sulcus and the anterior and posterior sulci, the apex is inferior and only the larger left side, and then the base is the superior flattened top of the heart. As we know the heart does conduct electricity, the resting threshold of the heart is -90mV and has a fast and slow channel. Fast channels are transitory whereas slow channels are long lasting which allows for prolonged depolarization. The heart has different rates of depolarizations, it has a central node (SA) which “is the heart 's natural pacemaker”(Medicine Net) which has a BPM of …show more content…
Atrioventricular node (AV) “serves as a gate that slows the electrical current before the signal is permitted to pass down through the ventricle” (Medicine Net) that has a BPM of 40-50. There are multiple cardiovascular diseases that can occur in some people that can be moderate and some severe. A heart attack is one of them and it happens when blood is blocked by a clot, making the heart unable to pump blood throughout the body. Most of cardiovascular diseases are related to lifestyles and other non-preventable factors like ages. Coronary artery disease is a heart disease, that is caused by atherosclerosis, which is a buildup of plaque in the arteries which causes less blood flow to the heart. If plaque were to rupture it can block blood vessels which then leads to “unstable angina or a heart attack” (NHLBI). The heart also has different heart rhythms, people with bradycardia have a slow heart rate sometimes below 60. Some causes of bradycardia are increased vagal tone, SA disease, and digitoxin od. However, sometimes this can be normal in athletes who are very fit. On the opposite side we have tachycardia, which has a heart greater than 100 BPM. The causes for tachycardia usually are exercise, fever, anxiety, hypovolemia, anemia, pump failure, hypoxia, and high parathyroid
the heart is made of a muscle called the cardiac muscle unlike other muscles in the body the cardiac muscle never gets tiered its constantly working and never stops. It squeezes blood out of the heart and then relaxes it to fill it back with blood again in and this process continues and happens everyday until you are dead. The heart beats non stop this is achieved because of the cardiac Muscle.
The heart is two sided and has four chambers and is mostly made up of muscle. The heart’s muscles are different from other muscles in the body because the heart’s muscles cannot become tired, so the muscle is always expanding and contacting. The heart usually beats between 60 and 100 beats per minute. In the right side of the heart, there is low pressure and its job is to send red blood cells. Blood enters the right heart through a chamber which is called right atrium. The right atrium is another word for entry room. Since the atrium is located above the right ventricle, a mixture of gravity and a squeeze pushes tricuspid valve into the right ventricle. The tricuspid is made up of three things that allow blood to travel from top to bottom in the heart but closes to prevent the blood from backing up in the right atrium.
When expecting a baby, parents hope their child is born with ten tiny toes, ten little fingers, the perfect little button nose, and a smile made out of gold. Most may not think about the vital development and intricacies of their baby's heart. Once the baby is born, parent’s uncertainties may be laid to rest as technology has provided the world with multiple means of being able to detect the most miniscule of abnormalities. One of which includes the electrocardiogram as this device is able to monitor and record the electrical impulses the heart is generating. With the addition of this device, a doctor can detect abnormal rhythms in the heart. By using machines such as the electrocardiogram, examining heart murmurs, and aortic stenosis, the parent will be able to be informed and prepared for any ailments of the heart a child may develop.
Through the process of each heartbeat, cardiac muscle contraction follows an electrical sequence. This sequence is initiated at the SA node generating an impulse which spreads through the AV node causing atrial systole. The electrical impulse then follows the AV bundle, bundle branches and the purkinje fibers producing ventricular systole. Series of electrical currents through the heart are able to be traced on the body surface by an electrocardiogram or ECG machine, a device that records voltage and time through the activity of each cardiac cycle. As stated above, the ECG recordings are shown by deflection waves that represent electrical events, starting with the baseline which is broken by the P wave caused by atrial depolarization. The QRS
The cardiovascular system - The cardiovascular system is responsible for transporting nutrients and removing gaseous waste from the body. It consists of the heart, which powers the whole process, the veins, arteries, and capillaries, which deliver oxygen to tissue at the cellular level. The cardiovascular system carries blood that is low in oxygen away from the heart to the lungs via arteries, where oxygen levels are restored through the air once oxygenated, this blood is then carried throughout the body via arteries, keeping our organs and tissue alive. The cardiovascular system is the workhorse of the body, continuously moving to push blood to the cells. If this important system ceases its work, the body dies.
The heart is a pump with four chambers made of their own special muscle called cardiac muscle. Its interwoven muscle fibers enable the heart to contract or squeeze together automatically (Colombo 7). It’s about the same size of a fist and weighs some where around two hundred fifty to three hundred fifty grams (Marieb 432). The size of the heart depends on a person’s height and size. The heart wall is enclosed in three layers: superficial epicardium, middle epicardium, and deep epicardium. It is then enclosed in a double-walled sac called the Pericardium. The terms Systole and Diastole refer respectively and literally to the contraction and relaxation periods of heart activity (Marieb 432). While the doctor is taking a patient’s blood pressure, he listens for the contractions and relaxations of the heart. He also listens for them to make sure that they are going in a single rhythm, to make sure that there are no arrhythmias or complications. The heart muscle does not depend on the nervous system. If the nervous s...
From there the impulse travels along the left and right bundle branches in the septum of the heart all the way to the Purkinje fibers. At this point, the blood has flowed from the atria to the ventricles. The impulse signal in the Purkinje fibers is allowing the apex of the heart to contract. Allowing the apex to contract first allows for the heart to work more efficiently. As soon as the apex contracts, the AV valves close and the walls of the heart begin to contract which pull the papillary muscles. The papillary muscles have chordae tendineae that attach themselves to the atrioventricular valves. These chordae tendineae work to try and prevent AV valve prolapse. When the pressure is great enough in the ventricles to overcome the resting blood on the other side of the arteries, the blood will be pushed out of the ventricles and will be passed through the semilunar valves. The right ventricle pushed blood through the pulmonary semilunar valve, and the left ventricle will push blood through the aortic semilunar valve. When the ventricles have expelled as much blood as they can and the pressure returns to a lower level the heart will begin to relax allowing the semilunar valves to close. Excess blood that does not get pushed along the arteries will remain on the artery side of the semilunar
The heart, blood and blood vessels make up the cardiovascular system. The function of the cardiovascular system is to evenly distribute blood cells, water and nutrients. The cardiovascular system helps send blood to the body’s tissues. The heart is a muscle and the most important part of the cardiovascular system. Heart attacks, heart failure, and abnormal heart beat is a serious issue for the cardiovascular system these can sometimes lead to death. These diseases affect the heart and its functions (Heart and Cardiovascular disease 2005).
Heart disease, also known as cardiovascular disease, is a disorder that affects the heart. Heart disease is the leading cause of death of most ethnicities in the United States, including African Americans, Hispanics, and Whites. For American Indians or Alaska Natives and Asian or Pacific Islanders, heart disease is the second leading death. Although heart disease is often thought of as a problem for men, more women than men die of heart disease each year.
The heart serves as a powerful function in the human body through two main jobs. It pumps oxygen-rich blood throughout the body and “blood vessels called coronary arteries that carry oxygenated blood straight into the heart muscle” (Katzenstein and Pinã, 2). There are four chambers and valves inside the heart that “help regulate the flow of blood as it travels through the heart’s chambers and out to the lungs and body” (Katzenstein Pinã, 2). Within the heart there is the upper chamber known as the atrium (atria) and the lower chamber known as the ventricles. “The atrium receive blood from the lu...
When a muscle contracts and relaxes without receiving signals from nerves it is known as myogenic. In the human body, the cardiac muscle is myogenic as this configuration of contractions controls the heartbeat. Within the wall of the right atrium is the sino-atrial node (SAN), which is where the process of the heartbeat begins. It directs consistent waves of electrical activity to the atrial walls, instigating the right and the left atria to contract at the same time. During this stage, the non conducting collagen tissue within the heart prevents the waves of electrical activity from being passed directly from the atria to the ventricles because if this were to happen, it would cause a backflow. Due to this barrier, The waves of electrical energy are directed from the SAN to the atrioventricular node (AVN) which is responsible for transferring the energy to the purkyne fibres in the right and left ventricle walls. Following this, there is a pause before the wave is passed on in order to assure the atria has emptied. After this delay, the walls of the right and left ventricles contract
The heart is the organ that pumps the blood throughout the body. It has three chambers: the atria, the ventricles, and the septum. It also contains two main valves: the tricuspid and the bicuspid (the atrioventricular valves). It has two sections that carry the different types of blood (oxygenated and deoxygenated). The oxygen depleted blood goes through the right atrium to the right ventricle. From the right ventricle the blood goes out of the pulmonary artery to the lungs; which is referred to as the pulmonary circuits. The oxygen rich blood goes from the lungs to the left ventricle. From the left atrium, it travels to the left ventricle and out through the aorta to the different parts of the body; referred to as the systemic
The human heart has four chambers, the right atrium, left atrium, left ventricle, and right ventricle. The human heart has a ton of amazing features. The normal heart rate for adults is 120/80. The human heart weighs twelve ounces and beats at seventy-two beats per minute it is the size of a human fist. Its blood flow has many functions and is extremely vital to our bodies. We would not be able to survive without our heart. I will talk about the functions of our heart and the blood flow of our heart. I will go in detail to let you know things you probably have never heard. Our heart, its four chambers, and blood flow are very interesting and vital to our well-being. Many things can ruin the process of the heart and the way that it works. I will talk about all of the ways that ruin it and I will cover the valves of the heart as well, which are important to the blood flow of the heart.
Elaborate: The cardiac cycle of the heart is divided into diastole and systole stages. Diastole refers to the period of relaxation experienced by the atria and ventricles. Systole is the contraction of the atria and ventricles. The pattern of blood flow starts in the left atrium to right atrium then into the left ventricle and right ventricle. During its course, blood flows through the mitral and tricuspid valves. Simultaneously, the right atrium is granted blood from the veins through the superior and inferior vena cava. The job of the superior vena cava is to transport de-oxygenated blood to
Your Heart and Blood Vessels – Illustrations and facts of the anatomy of the heart.