The tissues of cardiac muscle have unique structures known as
A) circular muscle fibers.
B) abundant elastic fibers.
C) intercalated disks.
D) pacemaker cells.
Answer: C) intercalated disks.
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The term ductus venosus refers to ________
A) damage to the valves in the veins, leading to varicose veins B) a condition of the aged in which the arteries lose elasticity C) a fetal shunt that bypasses the lungs D) a special fetal vessel that allows umbilical blood to bypass the liver
Using the figure above, identify the labeled part.
1. Label A: ______________________________
2. Label B: ______________________________
3. Label C: ______________________________
4. Label D: ______________________________
5. Label E: ______________________________
6. Label F: ______________________________
7. Label G: ______________________________
8. Label H: ______________________________
9. Label I: ______________________________
10. Label J: ______________________________
11. Label K: ______________________________
12. Label L: ______________________________
13. Label M: ______________________________
14. Label N: ______________________________
15. Label O: ______________________________
Which statement is incorrect?
a. The "iodide pump" of the follicular cells is important for thyroid hormone production. b. Thyroid hormones are formed within a much larger molecule called thyroglobulin. c. Thyroid hormone synthesis is greatly stimulated by the presence of TSH. d. A two-hour supply of thyroid hormone is stored in the lumen of the thyroid follicles. e. The coupling of two DIT molecules yields thyroxine.
Enlargement of the adrenal glands is termed:
A) adrenitis B) adrenoma C) adrenomegaly D) adrenalectomy E) adrenalotomy