Transport in animals Flashcards
why is blood transported in the body
oxygen
nutrients- glucose, amino acids, proteins, lipoproteins
temperature
what do the pulmonary arteries do
carry deoxygenated blood to the lungs
what does the aorta do
the main artery of the body; carries oxygenated blood out to the tissues. Blood pressure is at its highest in the aorta and the strongest pulse is felt here
what does the pulmonary vein do
returns oxygenated blood from the lungs. A vein from each lung join together before entering the left atrium
what does the left atrium do
receives oxygenated blood returning from the lungs. Atria have thin walls because they need only pump blood to the ventricles
what does the wall of the left ventricle do
thick and muscular because it must force blood through the arteries to all the tissues of the body
what doe sthe septum do
wall between left and right sides of the heart. This separates oxygenated and deoxygenated blood.
what does the wall of the right ventricle do
less muscular that left ventricle because it needs only force blood along the pulmonary arteries to the lungs
what do the tendons do
tendons which are tightened to make sure that the valve does not turn inside out when the ventricle walls contract
what does the right atrium do
receives deoxygenated blood from the vena cava. The pacemaker is found in the wall of the right atrium
what does the vena cava do
the main vein of the body; returns deoxygenated blood from the head and lower body to the right atrium
what do the semilunar valves do
prevent blood running back into the ventricles when pressure falls during relaxation
what do the left atriventricular valves
when this valve is closed and the ventricle contracts, the blood must leave through the aorta
what is a cardiac cycle
a cardiac cycle is the contraction of atria and ventricle
what does the electrocardiogram do
measures electrical impulses occuring in the heart
