Anatomy and Physiology Proctored Study Guide

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Sample questions from Anatomy and Physiology Proctored Study Guide

This material has 20 questions with answers and rationales. Here are the first 5.

1. 1.After walking outdoors on a hot day, a person develops increased sweating and dilation of blood vessels in the skin. Which explanation best describes these responses?

   • A.Positive feedback increases heat production until body temperature exceeds its normal range.
   • B.Negative feedback promotes heat loss to move body temperature toward its normal range.
   • C.Negative feedback decreases heat transfer by reducing blood flow near the body surface.
   • D.Positive feedback lowers body temperature by stimulating skeletal muscle shivering.

   Rationale: Sweat evaporation and increased skin blood flow promote heat loss, opposing the initial temperature rise through negative feedback. Positive feedback amplifies a change rather than correcting it. Reducing skin blood flow conserves heat instead of increasing heat loss. Shivering generates heat through skeletal muscle activity and is primarily a response to cold.

2. 2.A nursing student is reviewing how cellular energy supports skeletal muscle function. Which statement correctly describes the role of ATP during muscle contraction and relaxation?

   • A.ATP binding keeps myosin attached to actin until calcium leaves the muscle cell.
   • B.ATP replaces calcium at troponin to expose binding sites on actin.
   • C.ATP directly opens the joint capsule to permit movement between bones.
   • D.ATP binding releases myosin from actin, and ATP powers calcium transport back into the sarcoplasmic reticulum.

   Rationale: ATP binding allows myosin to detach from actin, and ATP-dependent pumps return calcium to the sarcoplasmic reticulum during relaxation. ATP does not maintain attachment; insufficient ATP prevents detachment. Calcium, not ATP, binds troponin to expose actin binding sites. Joint capsules enclose and stabilize synovial joints; ATP does not directly open them.

3. 3.Shortly after a carbohydrate-containing meal, blood glucose rises. Which sequence correctly connects digestion, absorption, and endocrine regulation?

   • A.Carbohydrates are broken down into monosaccharides, glucose enters intestinal blood capillaries, and pancreatic beta cells increase insulin secretion.
   • B.Carbohydrates are absorbed mainly as intact starch molecules, which stimulate pancreatic alpha cells to release insulin.
   • C.Glucose enters intestinal lymphatic vessels first, and pancreatic beta cells release glucagon to promote its storage.
   • D.Most carbohydrate absorption occurs in the stomach, and the liver releases insulin to increase blood glucose.

   Rationale: Digestible carbohydrates are reduced to monosaccharides and absorbed mainly in the small intestine into blood capillaries. Rising glucose stimulates pancreatic beta cells to release insulin. Intact starch is not normally absorbed, and alpha cells secrete glucagon rather than insulin. Glucose primarily enters blood, not intestinal lymphatic vessels. The stomach is not the main absorption site, and the pancreas, not the liver, produces insulin.

4. 4.A patient has acute blood loss from a deep wound. Which combination of responses would help limit bleeding and maintain tissue perfusion?

   • A.Parasympathetic stimulation increases heart rate, while platelets dissolve the developing clot.
   • B.Systemic arteriolar dilation increases blood pressure, while reduced fibrin production strengthens the clot.
   • C.Sympathetic stimulation increases heart rate and contractility, while platelets and fibrin help seal the damaged vessel.
   • D.Reduced antidiuretic hormone secretion conserves water, while lymphatic vessels produce red blood cells.

   Answer and rationale are in the full material.

5. 5.A patient receiving an opioid develops slow, shallow breathing. Testing shows increased arterial carbon dioxide and decreased blood pH. If this problem persists, which renal response would help compensate?

   • A.Increased bicarbonate excretion and decreased hydrogen ion secretion
   • B.Increased hydrogen ion excretion and increased bicarbonate reabsorption and generation
   • C.Decreased hydrogen ion excretion and decreased bicarbonate generation
   • D.Increased carbon dioxide filtration as the primary mechanism for removing retained respiratory gases

   Answer and rationale are in the full material.