BIOS 256 Week 7 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A –
Chamberlain
1. Which hormone regulates calcium levels in the blood?
A. Parathyroid hormone (PTH)
B. Aldosterone
C. ADH
D. Calcitonin
Correct Answer: A
Rationale: PTH increases blood calcium by stimulating bone
resorption and kidney reabsorption.
2. Which hormone lowers blood calcium levels?
A. Parathyroid hormone
B. Calcitonin
C. Aldosterone
D. ADH
Correct Answer: B
Rationale: Calcitonin inhibits bone resorption, decreasing blood
calcium.
,3. Which vitamin is activated by the kidneys for calcium
absorption?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin K
Correct Answer: B
Rationale: Kidneys convert vitamin D to calcitriol, enhancing
intestinal calcium absorption.
4. Which cells release PTH?
A. Thyroid follicular cells
B. Parathyroid chief cells
C. Adrenal cortex cells
D. Beta cells of pancreas
Correct Answer: B
Rationale: Parathyroid chief cells secrete PTH in response to low
calcium levels.
5. Which cells secrete calcitonin?
A. Parafollicular (C) cells of thyroid
B. Chief cells of parathyroid
C. Beta cells of pancreas
D. Adrenal medulla cells
Correct Answer: A
,Rationale: C cells of thyroid release calcitonin to reduce blood
calcium.
6. Which organ removes metabolic waste and regulates
electrolytes?
A. Liver
B. Kidney
C. Heart
D. Lungs
Correct Answer: B
Rationale: Kidneys filter blood, excrete wastes, and maintain
electrolyte balance.
7. Which is the functional unit of the kidney?
A. Glomerulus
B. Nephron
C. Bowman's capsule
D. Loop of Henle
Correct Answer: B
Rationale: Nephron performs filtration, reabsorption, secretion, and
excretion.
8. Which part of nephron filters blood?
A. Proximal tubule
B. Glomerulus
, C. Distal tubule
D. Collecting duct
Correct Answer: B
Rationale: Glomerulus filters plasma to form filtrate.
9. Which part collects filtrate from glomerulus?
A. Bowman's capsule
B. Loop of Henle
C. Distal tubule
D. Collecting duct
Correct Answer: A
Rationale: Bowman's capsule surrounds glomerulus and collects
filtrate.
10. Which process moves water and solutes from blood to
nephron?
A. Filtration
B. Reabsorption
C. Secretion
D. Excretion
Correct Answer: A
Rationale: Filtration is driven by hydrostatic pressure in glomerular
capillaries.
11. Which process returns water and solutes from nephron to
blood?
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A –
Chamberlain
1. Which hormone regulates calcium levels in the blood?
A. Parathyroid hormone (PTH)
B. Aldosterone
C. ADH
D. Calcitonin
Correct Answer: A
Rationale: PTH increases blood calcium by stimulating bone
resorption and kidney reabsorption.
2. Which hormone lowers blood calcium levels?
A. Parathyroid hormone
B. Calcitonin
C. Aldosterone
D. ADH
Correct Answer: B
Rationale: Calcitonin inhibits bone resorption, decreasing blood
calcium.
,3. Which vitamin is activated by the kidneys for calcium
absorption?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin K
Correct Answer: B
Rationale: Kidneys convert vitamin D to calcitriol, enhancing
intestinal calcium absorption.
4. Which cells release PTH?
A. Thyroid follicular cells
B. Parathyroid chief cells
C. Adrenal cortex cells
D. Beta cells of pancreas
Correct Answer: B
Rationale: Parathyroid chief cells secrete PTH in response to low
calcium levels.
5. Which cells secrete calcitonin?
A. Parafollicular (C) cells of thyroid
B. Chief cells of parathyroid
C. Beta cells of pancreas
D. Adrenal medulla cells
Correct Answer: A
,Rationale: C cells of thyroid release calcitonin to reduce blood
calcium.
6. Which organ removes metabolic waste and regulates
electrolytes?
A. Liver
B. Kidney
C. Heart
D. Lungs
Correct Answer: B
Rationale: Kidneys filter blood, excrete wastes, and maintain
electrolyte balance.
7. Which is the functional unit of the kidney?
A. Glomerulus
B. Nephron
C. Bowman's capsule
D. Loop of Henle
Correct Answer: B
Rationale: Nephron performs filtration, reabsorption, secretion, and
excretion.
8. Which part of nephron filters blood?
A. Proximal tubule
B. Glomerulus
, C. Distal tubule
D. Collecting duct
Correct Answer: B
Rationale: Glomerulus filters plasma to form filtrate.
9. Which part collects filtrate from glomerulus?
A. Bowman's capsule
B. Loop of Henle
C. Distal tubule
D. Collecting duct
Correct Answer: A
Rationale: Bowman's capsule surrounds glomerulus and collects
filtrate.
10. Which process moves water and solutes from blood to
nephron?
A. Filtration
B. Reabsorption
C. Secretion
D. Excretion
Correct Answer: A
Rationale: Filtration is driven by hydrostatic pressure in glomerular
capillaries.
11. Which process returns water and solutes from nephron to
blood?
