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Blood is pumped from the heart to the gas exchange organ, back to the heart and then to the rest of the body.
Large cell with a large spherical or lobed nucleus which engulf bacteria and other microorganisms.
The number of heart beats per unit of time, usually expressed as beats per minute. Normally 70 times a minute.
It increases with exercise, stress, and the secretion of adrenaline.
It decreases when we sleep.
Small arteries, similar in structure to the larger ones, but have a high proportion of muscle fibres in their walls. They carry blood into organs from arteries.
Region of the medulla that controls heart functions.
It transports:
Oxygen from the lungs all other parts of the body.
-Carbon dioxide from all parts of the body to the lungs.
-Nutrients from all parts of the body to the lungs.
-Urea from the liver to the kidneys.
Bicuspid valve that lies between the left atrium and the left ventricle.
Carry blood around the body.
Rhythmic contraction of a chamber of the heart.
It moves blood by a series of contractions and relaxations of its chambers.