BIOC34H3 : study guide

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copperdonkey58

4 May 2011

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Slide 2: we have 3 sources of calcium, bone. deposition (calcification) of calcium into bones reduces plasma. resorption (break down) of bone increases plasma calcium levels: gut. plasma absorbs calcium from the gut: so the gut does not store calcium, kidneys. kidneys could filter calcium from the blood (filtration) or plasma could reabsorb calcium from the kidneys (reabsorption: regulation of calcium in the body is controlled by hormones, parathyroid hormone and calcitrol hormone. they both raise calcium plasma levels: calcitonin. reduces calcium plasma levels: hypocalcaemia: low blood calcium, hypercalcaemia: high blood calcium. increased calcium plasma level: so basically, if plasma [ca++] Slide 7: calcitrol, increases calcium plasma levels, not produced in a gland. but is instead derived from cholesterol: acts on guts and kidneys, cholesterol 7-dehydrocholesterol vitamin d3 25-hydroxyvitamin d3. calcitrol promotes absorption from gut and reabsorption from kidney into blood increased ca level www. notesolution. com.

Related Questions

1. Which, if any, of the following statements is true about theregulation of calcium levels in the blood?

a.) If calcium levels experience a significant drop, PTH levelscan be expected to rise

b.) If calcium levels experience a significant drop, PTH levelscan be expected to drop

c.) If phosphate levels experience even a slight drop, PTHlevels increse dramatically

d.) B and C

2.) An increse in the level of parathyroid hormone would beexpected to have which, if any, of the following effects?

a.) Increased activity of osteoblasts

b.) A decrease in excretion of phosphate by the kidneys

c.) A decrease in the activity of osteoclasts

d.) A and B

3.) Which of the following plays the biggest direct role inincreasing the intestinal absorption of Calcium?

a.) Calcitonin

b.) Calciferol

c.) Calcitriol

d.) Calsequestrin

4.) Our bodies attempt to tightly regulate blood calcium levels.This is an example of:

a.) Homeostasis

b.) Diastasis

c.) Hysteresis

d.) Automonic tone

5.) The _________ secretes a mix of norepinephrine, epinephrine,and dopamine when stimulated by the sympathetic nervous system

a.) Adrenal medulla

b.) Adrenal cortex

c.) Ovarian cortex

d.) Hypothalamus

e.) Pineal gland

6.) Stimulation of beta receptors results in:

a.) Dilation of bronchiole walls via constriction of smoothmuscle cells

b.) Dilation of bronchiole walls via relaxation of smooth musclecells

c.) Faster, stronger heartbeat

d.) A and C

e.) B and C

7.) The diameter of many Stimulation of beta receptors resultsin:

a.) A stronger, faster heartbeat

b.) A weaker, slower heartbeat

c.) No chance in the rate of strength of the heartbate

d.) None of the above

orchidmuskrat125

describe how parathyroid hormone affects blood levels of calciumand phosphorus

silvercoyote736

26. ______ Which of the following are direct target tissues ofPTH?

A. Bone

B. Small intestine

C. Kidney

D. Both A and C

E. All of the above

27. ______Which of the followingwould you expect to happen as a result of an inadequate

dietary intake of calcium?

A. loss of bone mass

B. retention of Ca²⁺ by the kidneys

C. release of calcitriol by the kidneys

D. increase absorption of calcium by the smallintestines

E. All of the above

28. ________Many different hormones circulate in the blood. Whatdetermines to which

hormone a tissue willrespond?

A. the concentration of hormonesin the ECF

B. the specific receptors foundon the cells of a tissue

C. the chemical nature of thehormone

D. All of the above.

redrhinoceros937

BIOC34H3 : study guide

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