When you change your posture from sitting to standing or lying down (supine position), some of the things occur in the body in response to this change. It includes change in the number of heart beats per minute (heart rate) and blood pressure (pressure of blood against arterial vessel walls).
When you change your position, you may feel slight dizziness, but this dizziness passes quickly and is due to the effect of gravity on the blood pressure.
Following are the cardiovascular changes that occur when you change your position:
Decrease in venous return of blood to the heart
Blood pools in the elastic-walled venous vessels feel the sudden increased gravitational pull on blood within your lower limbs;
Decrease in cardiac blood volume
In this lab, I took two recordings of my heart using an electrocardiogram. An electrocardiogram, EKG pg. 628 Y and pg. 688 D, is a recording of the heart's electrical impulses, action potentials, going through the heart. The different phases of the EKG are referred to as waves; the P wave, QRS Complex, and the T wave. These waves each signify the different things that are occurring in the heart. For example, the P wave occurs when the sinoatrial (SA) node, aka the pacemaker, fires an action potential. This causes the atria, which is currently full of blood, to depolarize and to contract, aka atrial systole. The signal travels from the SA node to the atrioventricular (AV) node during the P-Q segment of the EKG. The AV node purposefully delays
Kinesiology: The Mechanics & Pathomechanics of Human Movement (Second ed.). Glenside, Pennsylvania: Lippincott Williams & Wilkins. Qiao T, Liu C and Ran F. (2005) The impact of gastrocnemius muscle cell changes in chronic venous insufficiency. Eur J Vasc Endovase Surg 30; 430-436.
I am now reporting to you from the patient’s femoral vein. I am headed north to her right lung. The femoral vein is one of the largest veins in the body. The ride has been smooth so far. I have been seeing many different types of cells go by my submarine window. I just saw an army of white blood cells headed the same way that I am. They most likely are headed towards the bacteria infestation in the right lung. I am also hearing the heart beat; it is making a LUB- DUB sound. I can also hear the blood flow; it is making sort of a swooshing noise. That noise is reminding me of the ocean! The right femoral vein is now turning into the external iliac vein; I am now by the urinary system and reproductive system. This is also known has the pelvic region. As we continue north the eternal iliac vein is now called the common iliac vein. As we continue on, the common iliac vein is now called the inferior vena cava. We are getting closer to the heart! We are in the abdomen of the body. There are diff...
This study observed the standard and routine metabolic rates and swimming activities of nurse sharks. Nurse sharks use buccal pumping to rest on the sea floor. This sedentary behavior had not yet been studied in relation to metabolic rates before this study. This study also is one of few that observed the effcts of temperature on metabolism in sharks. By assessing the relationship between routine metabolism and ecology, a more precise understanding of the nurse sharks daily energy requirements could be obtained.
Cardiovascular Activity And How it Influences the body. Introduction: Cardiovascular fitness is a form of aerobic fitness (Neporent and Egan 1997). There are many different ways of evaluating the amount of oxygen used during cardiovascular fitness and one the methods involved is called VO2 Max. VO2 Max is the maximum amount of oxygen that the body can hold.
The human body is an amazing machine, we have cells, tissues, organs and organ system that come together to create the human race. Each system plays a key role in our bodies mechanism. Without each systems our bodies would not function properly, but what happens when one of these system fails? The Cardiovascular system components are blood, blood vessels and the heart. The hearts function is to pump blood to all the major organs and tissues (Circulatory). It’s also important to be aware of the derivation that our bodies may encounter, for example a stroke. In this passage I discuss different types of strokes, what are the signs and symptoms and after care for this disorder of the cardiovascular system.
The study of cardio physiology was broken up into five distinct parts all centering on the cardiovascular system. The first lab was utilization of the electrocardiogram (ECG). This studied the electrical activities of the heart by placing electrodes on different parts of the skin. This results in a graph on calibrated paper of these activities. These graphs are useful in the diagnosis of heart disease and heart abnormalities. Alongside natural heart abnormalities are those induced by chemical substances. The electrocardiogram is useful in showing how these chemicals adjust the electrical impulses that it induces.
Circulation, Stratified Meta-Analysis of Intermittent Pneumatic Compression of the Lower Limbs to Prevent Venous Thromboembolism in Hospitalized Patients, http://circ.ahajournals.org/content/128/9/1003.long
Yes. We noticed that our respiratory rate, pulse, and blood pressure changed when sitting, standing, and being in supine position. When looking at the three different positions, there was not a big difference when measuring my respiratory rate. My respiratory from lowest to highest is in the order of supine (11 BPM), standing (12 BPM), and lastly sitting (14 BPM). When looking at my pulse, there was quite a difference in the measurement. I had a lower pulse rate in the supine position, which is 80 bpm. My sitting pulse rate was 88 bpm and standing was 100 bpm. When looking at my blood pressure, my sitting and standing position measurement was the same, which is 120/70 mm Hg. However, my blood pressure in the supine position was 112/75 mm Hg. Therefore, I can conclude that my blood pressure is lower in the supine position than standing or sitting. This makes sense since your heart requires less energy to pump out blood to the rest of the body, than compared to standing or...
The purpose of this experiment was to gather data on how the amount of time spent active impacts the speed of heart rate in beats per minute. The hypothesis stated that if the amount of time active is lengthened then the speed of the heart rate is expected to rise because when one is active, the cells of the body are using the oxygen quickly. The heart then needs to speed up in order to maintain homeostasis by rapidly providing oxygen to the working cells. The hypothesis is accepted because the data collected supports the initial prediction. There is a relationship between the amount of time spent active and the speed of heart rate: as the amount of time spent active rose, the data displayed that the speed that the heart was beating at had also increased. This relationship is visible in the data since the average resting heart rate was 79 beats per minutes, while the results show that the average heart rate after taking part in 30 seconds of activity had risen to 165 beats per minute, which is a significantly larger amount of beats per minute compared to the resting heart rate. Furthermore, the average heart rates after 10 and 20 seconds of activity were 124 and 152 beats per minute, and both of which are higher than the original average resting heartbeat of 79.
I found out that this is because the blood is feeding the muscles oxygen at first then the body wants to lose heat from the body created my movement as well so the blood vessels
In our everyday lives, we almost take for granted this idea of balance or equilibrium that is maintained within our bodies. In general, no real thought processes are required. It is only when something is disturbed within our balance system that one is able to take notice of changes in the equilibrium. There may be several different factors that cause a disturbance to our bodies. One major area pertains to dizziness. Dizziness is found to be "the chief complaint in 8 million physician visits a year" (1). Vertigo is one type of dizziness, causing illusions of movement, that is being researched more and more today because of its widespread symptoms.
One of the most important changes would be an alteration in the concentration of hydrogen ions in the blood, this could be caused by a rise in blood carbon dioxide or an increase in tissue respiration in the muscles during the exercise. The respiratory centre is in its self. sensitive to raised hCo2 and responds by increasing the rate and depth. of the breath of the mind. In the aortic arch and carotid bodies there are chemoreceptors.
Our arteries and veins are like hoses, they normally have a nice clean flow, but sometimes our blood pressure can be raised when bad things happen to them. Arteries can get clogged, and that happening is much like sticking your finger at the head of the hose to make the water squirt farther, the same amount of liquid has to get through but now with a smaller hole, so it has to go faster (Tamarkin Ph.D., 2011). Blood pressure is always faster right at the end of a ventricular systole, because the blood receives a large push from the contraction and that speeds up all of the blood in the body for a little bit. The blood pressure is also determined by how fast the heart has to beat to get the blood to the body, so higher blood pressure normally occurs when one is doing a lot of physical activity, is angry, or is under stress. The pulse we feel when we feel our wrist or neck is a surge of blood coming from our heart, so when our pulse is faster than that means our blood pressure has risen (Cordova, et al.,
When standing up suddenly from a sitting position we may feel dizzy. This is due to blood rushing to the legs and reducing the supply of the blood to the brain, resulting in a sudden drop in blood pressure amounting to at least 20 mm Hg or diastolic blood pressure of at least 10 mm Hg. This may be a condition known as orthostatic hypotension (postural hypotension or orthostasis). This will be more prevalent among those having diabetes. Drinking one or two glasses of water will help.