Question 1

Which of the following best describes the concept of sensory receptor adaptation, and which type of receptor would be most likely to adapt rapidly to a constant stimulus?

Accepted Answer

Sensory receptor adaptation refers to the decrease in receptor sensitivity over time to a constant stimulus; phasic receptors adapt rapidly.

Question 2

A patient is unable to distinguish between two points when touched on the back, but can easily do so on the fingertips. Which concept explains this difference?

Accepted Answer

The receptive field size is smaller on the fingertips, allowing for greater two-point discrimination.

Question 3

Which equation correctly represents the ATP hydrolysis reaction that provides energy for muscle contraction?

Accepted Answer

$ATP + H_2O \rightarrow ADP + P_i + energy$

Question 4

Which of the following best explains the difference between excitation-contraction coupling in cardiac muscle compared to skeletal muscle?

Accepted Answer

Cardiac muscle relies on both extracellular and intracellular calcium for contraction, while skeletal muscle relies primarily on intracellular calcium.

Question 5

A person is exposed to a constant odor, but after a few minutes, they no longer notice it. Which type of receptor and adaptation process is responsible?

Accepted Answer

Phasic chemoreceptors undergo rapid adaptation, decreasing their response to the constant odor.

Question 6

Which pathway is responsible for transmitting fine touch and proprioceptive information to the brain?

Accepted Answer

Dorsal column-medial lemniscal pathway

Question 7

Which neurotransmitter is primarily released by postganglionic sympathetic neurons?

Accepted Answer

Norepinephrine

Question 8

A patient with damage to the primary visual cortex would most likely experience which of the following deficits?

Accepted Answer

Loss of conscious visual perception in the affected visual field

Question 9

Which of the following best describes the role of the creatine phosphate system in muscle cells during intense exercise?

Accepted Answer

It rapidly regenerates ATP from ADP using creatine phosphate, allowing short bursts of high-intensity activity.

Question 10

Which of the following equations represents the reaction catalyzed by creatine kinase in muscle cells?

Accepted Answer

$Creatine~phosphate + ADP \rightarrow Creatine + ATP$

Question 11

Which of the following is a major difference between smooth muscle and skeletal muscle contraction?

Accepted Answer

Smooth muscle contraction is regulated primarily by the autonomic nervous system, while skeletal muscle contraction is regulated by the somatic nervous system.

Question 12

Which of the following best explains the effect of antagonistic autonomic effects on the heart?

Accepted Answer

Sympathetic stimulation increases heart rate, while parasympathetic stimulation decreases heart rate.

Question 13

Which of the following is true regarding the process of phototransduction in rods?

Accepted Answer

Light causes the breakdown of rhodopsin, leading to hyperpolarization of the photoreceptor cell.

Question 14

Which of the following best describes the function of mechanoreceptors?

Accepted Answer

They detect physical deformation such as pressure, vibration, and stretch.

Question 15

A patient is experiencing muscle fatigue during prolonged exercise. Which of the following is a likely contributing factor?

Accepted Answer

Accumulation of lactic acid in muscle cells

Question 16

Which of the following statements about summation and tetanus in skeletal muscle is correct?

Accepted Answer

Summation occurs when multiple stimuli are delivered before the muscle can relax, leading to increased force; tetanus is a sustained contraction resulting from high-frequency stimulation.

Question 17

Which of the following best describes the difference between slow oxidative and fast glycolytic skeletal muscle fibers?

Accepted Answer

Slow oxidative fibers are fatigue-resistant and use aerobic metabolism, while fast glycolytic fibers fatigue quickly and use anaerobic metabolism.

Question 18

Which of the following is the correct order of events in excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential in the sarcolemma \rightarrow release of Ca^{2+} from the sarcoplasmic reticulum \rightarrow binding of Ca^{2+} to troponin \rightarrow cross-bridge formation

Question 19

Which of the following best explains the effect of beta-2 adrenergic receptor activation on bronchial smooth muscle?

Accepted Answer

Activation of beta-2 adrenergic receptors causes relaxation of bronchial smooth muscle, leading to bronchodilation.

Unit 3 Study Guide: Sensory Physiology, Somatosensory System, Special Senses, Autonomic Nervous System, and Muscle Physiology

Study Guide - Practice Questions

Study Guide - Flashcards