30 Questions
Blood which is returning to the heart from the brain will enter the
right atrium
which artery carries de-oxygenated blood?
pulmonary
although the heart beats rhythmically, the blood pressure in the arteries does not drop to zero between heart beats and the blood is kept in continuous motion. Which of the following best helps to explain these observations
the walls of arteries are elastic
a
macrophages
exchange of nutrients and waste material between the blood and the cells occurs through
intercellular fluid
a person suffering from a deficiency of RBC is unable to carry out prolonged vigorous physical exercise. main reason why?
insufficient oxygen carried by blood
which of the following blood proteins is concerned with blood clotting
fibrinogen
which of these is found in the blood plasma but not in lymph
RBC
which of the following blood proteins is concerned with blood clotting
fibrinogen
which of the following are most important in the formation of a blood clot when a blood vessel is damaged
damaged cells, platelets, prothrombin
inflammation in the area of a wound, like a tear in the skin, is a useful reaction to the damage because:
all the above
the membrane which completely encloses and protects the heart
pericardium
when heart muscles contract and relax respectively
diastole, systole
blood flow from the heart to lungs and back to heart is the
pulmonary circulation
the instrument used to measure blood pressure is called
sphygmomanometer
erythrocytes have a relatively short life span bcs they
lack a nucleus
tissue fluid and blood plasma both exist outside cells therefore they are
extracellular fluid
the % of plasma in blood is approximately
55
what is the function of atrioventricular valves?
to prevent back flow of blood from ventricles to atrium when ventricles contract
whats the function of semilunar valves
stop blood from flowing back into the ventricles when the ventricles relax.
what causes the lub dub sound?
closing of atrioventricular valves then semilunar valves
why do veins have valves?
blood flows at low pressure as it slows down when passing thru capillaries
from the internal layer to external layer, label artery/vein
endothelial cells, smooth muscle, elastin
which blood vessels make up the pulmonary circulation
pulmonary artery and vein
which blood vessels make up the systemic circulation
inf and sup vena cava and aorta
whats the general function of RBC
transport oxygen, remove CO2 by having it bind to haemoglobin
whats the general function of WBC
immune defense via. phagocytosis and production of antibodies; and memory
whats the general function of platelets
hemostasis: process of blood clotting which prevents excessive bleeding and wound healing and tissue repair
describe the function of the lymph vessel in the tissue
highly permeable so allow excess interstitial fluid to enter lymphatic system. Also carries away metabolic wastes and waste products away from tissue as well as excess proteins which will be processed and eliminated by the liver and kidney.
name two features of organs in the circulatory system which a giraffe would have
large muscular hearts, thick walled arteries
Test your knowledge on the pathway that blood takes when returning to the heart from the brain. Identify the specific blood vessels involved in this circulation.
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