Gbio 225 week 4 exam


1) Which of the following systems is the only one to have direct interactions with the other three?




2) Blood moves most slowly through




3) The bicuspid (mitral) valve is located between the

left and right atria.

right atrium and right ventricle.

left and right ventricles.

left atrium and left ventricle.
4) What occurs during systole?

The atrioventricular valves suddenly open.

The heart muscle tissues contract.

Oxygen-poor blood from all body regions except the lungs flows into the right atrium.

Oxygen-rich blood is pumped to the lungs.
5) If a physician hears two “lub” sounds instead of one, then which of the following conditions is true?

The AV and semilunar valves are not closing at the same time.

The semilunar valves are not closing simultaneously.

The atrial blood is flowing backward and causing the extra sound.

The atrioventricular valves are not closing at the same time.
6) The pulmonary circulation

leads to, through, and from the lungs.

leads to, through, and from the heart.

involves the hepatic portal vein.

includes the coronary arteries.
7) Heart excitation originates in the

intercalated disk.

atrioventricular node.

sinoatrial node.

8) The heart

is completely independent of all nervous control.

is activated primarily through the autonomic nervous system.

will contract as a result of stimuli from the sinoatrial node.

contracts only as a result of nerve stimulation from the central nervous system.
9) Systolic pressure is

the lowest blood pressure in the aorta.

the pressure measured when the left ventricle is relaxed.

the difference between the highest and lowest pressures.

the peak pressure in the aorta when the left ventricle contracts.
10) Which of the following vessels offers more resistance to blood flow than the others?



11) At the arteriole end of the capillary, precapillary sphincters

force blood back into veins.

control blood flow into capillaries.

control blood flow into venules.

force blood back into arteries.
12) Which cell is the most abundant in the human body?




13) What is the function of hemoglobin?

to transport nutrients

to transport oxygen

to transport oxygen and carbon dioxide

to transport carbon dioxide
14) All but which of the following can occur in the blood?

stabilization of pH

digestion of nutrients

transport of phagocytic cells

combining of oxygen with hemoglobin
15) The most abundant white blood cells are




16) All of the following promote the unloading of oxygen to needy tissues EXCEPT

small diameter blood vessels.

high metabolism.

abundant oxygen supply.

higher temperatures.
17) In humans, which cell does NOT have a nucleus when mature?




18) When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an increase in red blood cell production?




19) If you are blood type A,

you carry antibodies for type B blood.

you carry markers for type B blood.

you can donate blood to a person with type O blood.

you can receive blood from a person with type AB blood.
20) Which blood type is the universal donor?




21) In the Rh disease,

the mother must be negative and her first and second children positive.

the mother must be positive and her first and second children positive.

the mother and the father must both be negative and the child positive.

the mother must be negative and her first and second children negative.
22) Which of the following may be affected by altitude?

white blood cell count



red blood cell count
23) Which of the following is NOT involved in the formation of a blood clot?




plasma cells
24) How does aspirin help to reduce clotting?

it reduces the red blood count

it binds to fibrin

it reduces platelet aggregation

it reduces the platelet count
25) Which of the following is NOT a function of the nasal cavities?

oxygenate the blood

filter dust out of the incoming air

detect odors

warm the air
26) Oxygen and carbon dioxide are exchanged due to the process of

facilitated diffusion.


active transport.

27) During inhalation,

the pressure in the pleural sac is less than the pressure within the lungs.

movement of the diaphragm is inhibited.

the pressure in the thoracic cavity is greater than the pressure within the lungs.

the diaphragm moves upward and becomes more curved.
28) Oxygen moves from alveoli to the bloodstream

because the concentration of oxygen is greater in alveoli than in the blood.

mainly due to the activity of carbonic anhydrase in the red blood cells.

by using the assistance of carbaminohemoglobin.

because the concentration of carbon dioxide is greater in alveoli than in the blood.
29) Most of the carbon dioxide produced by the body is transported to the lungs

dissolved in blood plasma.

bound to potassium carbonate ions.

as carbonic acid molecules.

as bicarbonate ions.
30) Infant respiratory distress syndrome is caused by

surfactant-secreting cells that do not work yet.

underdeveloped alveoli.

underdeveloped bronchi.

clogged bronchioles.

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