Question 1

Which of the following best describes the structural organization of skeletal muscle tissue?

Accepted Answer

Skeletal muscle fibers are long, cylindrical, multinucleated, striated, and under voluntary control.

Question 2

A patient presents with a disorder affecting the neuromuscular junction. Which step in skeletal muscle contraction is most directly impaired?

Accepted Answer

Binding of acetylcholine to receptors on the motor end plate.

Question 3

Which equation best represents the Nernst equation used to calculate the equilibrium potential for potassium ions ($$K^+) in $$neurons?

Accepted Answer

$$E_K = \frac{RT}{zF} \ln \left( \frac{[K^+]_{out}}{[K^+]_{in}} \right)$$

Question 4

Which of the following is a unique characteristic of cardiac muscle tissue compared to skeletal and smooth muscle?

Accepted Answer

Cardiac muscle cells contain intercalated discs that allow rapid electrical communication.

Question 5

During the propagation of an action potential, which event occurs immediately after the threshold is reached?

Accepted Answer

Voltage-gated sodium channels open, causing rapid depolarization.

Question 6

Which of the following best explains how smooth muscle tissue contributes to homeostasis in the digestive system?

Accepted Answer

Smooth muscle produces rhythmic contractions (peristalsis) to propel food and mix digestive contents.

Question 7

Which neurotransmitter is most commonly released at the neuromuscular junction to initiate skeletal muscle contraction?

Accepted Answer

Acetylcholine

Question 8

A neuron is classified as multipolar. Which of the following best describes its structure?

Accepted Answer

One axon and multiple dendrites extending from the cell body.

Question 9

Which of the following best describes the function of neuroglia in the central nervous system?

Accepted Answer

Neuroglia provide structural support, insulation, and maintain the environment for neurons.

Question 10

Which of the following scenarios best illustrates the function of spinal reflexes?

Accepted Answer

A person withdraws their hand from a hot surface before feeling pain.

Question 11

Which of the following is a correct sequence of events during synaptic transmission at a chemical synapse?

Accepted Answer

Action potential arrives at axon terminal, calcium influx occurs, neurotransmitter is released, neurotransmitter binds to postsynaptic receptors.

Question 12

Which of the following best describes the role of white matter in the central nervous system?

Accepted Answer

White matter consists of myelinated axons that transmit signals between different regions of the CNS.

Question 13

A muscle fiber is observed under a microscope and shows alternating light and dark bands. Which structural component is responsible for this appearance?

Accepted Answer

The arrangement of actin and myosin filaments within sarcomeres.

Question 14

Which equation best represents the Goldman-Hodgkin-Katz equation for calculating the resting membrane potential ($$V_m) in $$neurons?

Accepted Answer

$$V_m = \frac{RT}{F} \ln \left( \frac{P_{K^+}[K^+]_{out} + P_{Na^+}[Na^+]_{out} + P_{Cl^-}[Cl^-]_{in}}{P_{K^+}[K^+]_{in} + P_{Na^+}[Na^+]_{in} + P_{Cl^-}[Cl^-]_{out}} \right)$$

Question 15

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated axons?

Accepted Answer

Myelinated axons allow action potentials to jump between nodes of Ranvier via saltatory conduction.

Question 16

Which of the following is a functional classification of neurons based on their role in the nervous system?

Accepted Answer

Sensory (afferent), motor (efferent), interneurons

Question 17

A patient with damage to gray matter in the spinal cord would most likely experience which of the following?

Accepted Answer

Impaired processing and integration of sensory and motor information.

Question 18

Which of the following best describes the effect of inhibitory neurotransmitters on the postsynaptic membrane?

Accepted Answer

They cause hyperpolarization, decreasing the likelihood of an action potential.

Question 19

Which of the following scenarios best illustrates the integration of multiple concepts: A person steps on a sharp object and withdraws their foot. Which sequence of events occurs?

Accepted Answer

Sensory neuron transmits signal to spinal cord, interneuron processes information, motor neuron activates muscle contraction, reflex occurs.

Anatomy & Physiology: Muscle and Nervous Tissue Study Guidance

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