Q: Which equation correctly represents the sliding filament theory of muscle contraction?

$$ \text{Actin} + \text{Myosin} + \text{ATP} \rightarrow \text{Cross-bridge formation} \rightarrow \text{Muscle contraction} $$

Q: Which of the following equations best represents the relationship between stimulus intensity and action potential frequency in a neuron?

$$ \text{Increased stimulus intensity} \rightarrow \text{Increased frequency of action potentials} $$

Question 1

Which of the following best describes the role of acetylcholine at the neuromuscular junction?

Accepted Answer

It binds to receptors on the muscle cell membrane, triggering an action potential.

Question 2

A patient is unable to dorsiflex their foot after a car accident. Which nerve is most likely damaged?

Accepted Answer

Common peroneal (fibular) nerve

Question 3

Which of the following best explains the difference between isotonic and isometric muscle contractions?

Accepted Answer

Isotonic contractions involve a change in muscle length, while isometric contractions do not.

Question 4

During a marathon, a runner experiences muscle fatigue. Which of the following is a likely cause?

Accepted Answer

Excessive accumulation of lactic acid in muscle fibers

Question 5

Which equation correctly represents the sliding filament theory of muscle contraction?

Accepted Answer

$$ 	ext{Actin} + 	ext{Myosin} + 	ext{ATP} ightarrow 	ext{Cross-bridge formation} ightarrow 	ext{Muscle contraction} $$

Question 6

A person suffers a stroke affecting the right side of their brain. Which of the following symptoms is most likely?

Accepted Answer

Paralysis of muscles on the left side of the body

Question 7

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts the passage of certain substances from the blood into the brain.

Question 8

Which of the following is a function of the cerebellum?

Accepted Answer

Coordination of voluntary muscle movements and balance

Question 9

A patient presents with loss of pain and temperature sensation on the left side of the body and paralysis on the right side. Which spinal cord tract is most likely damaged?

Accepted Answer

Spinothalamic tract

Question 10

Which of the following best describes the difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

The sympathetic division increases heart rate and dilates pupils, while the parasympathetic division decreases heart rate and constricts pupils.

Question 11

Which of the following correctly matches a sensory receptor with its function?

Accepted Answer

Photoreceptor: detects light

Question 12

A person with conductive deafness would most likely have damage to which structure?

Accepted Answer

Tympanic membrane

Question 13

Which of the following equations best represents the relationship between stimulus intensity and action potential frequency in a neuron?

Accepted Answer

$$ 	ext{Increased stimulus intensity} ightarrow 	ext{Increased frequency of action potentials} $$

Question 14

Which of the following best explains why the sense of taste may diminish with age?

Accepted Answer

Decreased number of taste buds and reduced saliva production

Question 15

A patient is unable to maintain balance when standing still with eyes closed. Which sensory system is most likely impaired?

Accepted Answer

Vestibular (equilibrium) system

Question 16

Which of the following best describes the function of the organ of Corti?

Accepted Answer

It converts sound vibrations into nerve impulses.

Question 17

Which of the following is a correct sequence for the pathway of light through the eye to the retina?

Accepted Answer

Cornea $$\rightarrow$$ lens $$\rightarrow$$ vitreous humor $$\rightarrow$$ retina

Question 18

Which of the following best explains the process of accommodation in the eye?

Accepted Answer

The lens changes shape to focus light on the retina.

Question 19

Which of the following is a function of the gray matter in the spinal cord?

Accepted Answer

Integrating reflexes and processing information

Question 20

A person is able to localize the source of a sound because:

Accepted Answer

The brain compares differences in timing and intensity of sound arriving at each ear.

Study Guide: The Muscular System, Nervous System, and Sense Organs

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