All the circulating red blood cells in an adult originate in the
A) heart.
B) thymus.
C) spleen.
D) red bone marrow.
E) lymph tissue.
D
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Describe the action of a Na+-K+ pump
What will be an ideal response?
When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
A) latent period B) refractory period C) fatigue period D) relaxation period
A sudden rise in blood pressure in the carotid artery would
A) initiate the baroreceptor reflex. B) cause a reduction in heart rate and force of contraction. C) produce a reflex coordinated by the cardiac center in the medulla oblongata. D) All of the answers are correct. E) None of the answers are correct.
Which of the following is not a function of smooth muscle tissue
A) Altering the diameter of the respiratory passageway B) Elevating hairs on the arm C) Forcing blood from the heart into the major arteries D) Moving food materials along the digestive tract E) Forcing urine out of the urinary tract