Exploring Our Cardiovascular System

Exploring Our Cardiovascular System

Our cardiovascular system consists of the heart, vascular system and

blood. These organs all work together to supply oxygen to our body,

which we need to live.

BLOOD

Blood is used as a transport system, this picks up oxygen from around

our body, and haemoglobin puts the oxygen into cells called red blood

cells. Then this gets moved to our muscles that are contracting ready

for movement to take place.

HEART

The heart this is the strongest muscle in the body, and has four parts

to it these are called chambers, the heart also has separate parts to

it these are called chambers. The left side of the heart consists of

oxygenated blood and the right side consists of de- oxygenated.

The cycle of the heart, our heart never stops beating. The vein called

the pulmonary vein, this vein is attached to the lungs to collect

oxygen. Haemoglobin then picks up the oxygen and this is then put into

red blood cells. This is then turned into oxygenated blood and brought

to the heart by the pulmonary vein. The pulmonary vein is the only

artery in our body which consists of oxygenated blood. This is when

the heart beat contraction takes place, the mitrial valves open; this

then lets blood flow through into the left ventricles. This is where

the ventricular systole contraction takes place.

After the oxygen is used, a gas called carbon dioxide is produced; the

veins carry blood through to the heart. To get to the heart it flows

through the vena cava this then goes through to the right atrium, this

is when the mitrial valves open and blood goes through to the right

ventricle. This then gets pumped to our lungs through the pulmonary

artery.

TRAINING

Training affects our cardio vascular system in numerous ways. The

heart during training increases in size and contracts constantly and

becomes quicker. Capillaries grow around the heart so that more oxygen

can be supplied. Our recovery heart rate will go back to normal