Venous return is affected by
a. the cardiac suction effect.
b. the respiratory pump.
c. the skeletal muscle pump.
d. none of these.
e. all of these.
E
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Which of the following describes the function of C cells?
A) These cells do not stain as clearly as do the follicular cells. B) Their secretions assist the function of parathyroid hormone. C) They produce the hormone calcitonin. D) They are larger than the cells of the follicular epithelium. E) They lie among the cuboidal follicle cells in the thyroid gland.
If the gonads fail to develop very early during human development, the contributions of which germ layer may be deficient?
A) epiderm B) ectoderm C) periderm D) endoderm E) mesoderm
Answer the following questions true (T) or false (F)
1. Arteries in the systemic circuit carry oxygenated blood while arteries in the pulmonary circuit transport deoxygenated blood. 2. Veins regulate blood pressure and control blood flow to organs. 3. Vessels with a smaller radius will have an increased resistance to blood flow.
The thymus, spleen, and tonsils are principal organs of the ________ system.
A. respiratory B. muscular C. lymphatic D. endocrine E. circulatory