Na+ and K+ both use ________ to passively diffuse across the plasma membrane
A) facilitated diffusion
B) exocytosis
C) voltage-gated channels
D) leak channels
E) carrier-mediated transport
Answer: D
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Label L represents which structure(s)?
A) mucosal glands
B) mucosa
C) villi
D) mucous epithelium
E) lamina propria
Match each vitamin or mineral with its function in the body.
a. vitamin A b. vitamin B12 (cyanocobalamin) c. vitamin B3 (niacin) d. vitamin D (calciferol) e. calcium f. iron g. iodine h. phosphorous i. vitamin E j. vitamin B6 k. vitamin C l. vitamin K m. sodium n. chlorine 1. _____ A vitamin that helps enzymes in the citric acid cycle 2. _____ A mineral that is important in the structure of RNA, DNA, and ATP 3. _____ A mineral that is necessary for the production of blood 4. _____ A vitamin that is important in the production of blood 5. _____ A vitamin that is important in the production of visual pigment 6. _____ A mineral that is important in bone formation 7. _____ A mineral that is important in the production of thyroid hormones 8. _____ A vitamin that aids in the absorption of calcium 9. _____ A vitamin that helps in the manufacture of collagen fibers 10. _____ A mineral that helps in muscle and nerve function and in fluid balance 11. _____ A vitamin that acts as an antioxidant that prevents free-radicals from damaging the cell 12. _____ A vitamin that helps in blood clotting 13. _____ A mineral that helps in stomach acid production and in acid-base balance 14. _____ A vitamin that helps enzymes that catabolize amino acids
Which are characteristics used in the naming of muscles? Select all that apply.
A. Origin and insertion B. Agonist or antagonist C. Size and shape D. Region of the body E. Class of lever
The plasma membrane of a muscle cell is known as the:
A) sarcoplasmic reticulum. B) sarcolemma. C) sarcomere. D) myofibril.