Question 1

Which of the following best describes a synovial joint?

Accepted Answer

A joint where bones are separated by a fluid-filled cavity and enclosed by a joint capsule.

Question 2

Which of the following is a key difference between voltage-gated and ligand-gated ion channels?

Accepted Answer

Voltage-gated channels open in response to changes in membrane potential, while ligand-gated channels open in response to the binding of specific molecules.

Question 3

What is the primary cause of the resting membrane potential in excitable cells?

Accepted Answer

The differential permeability of the plasma membrane to potassium and sodium ions, and the activity of the Na	extsuperscript{+}/K	extsuperscript{+} ATPase pump.

Question 4

During depolarization of a muscle fiber, which event occurs?

Accepted Answer

Sodium ions rapidly enter the cell, making the inside more positive.

Question 5

Which of the following is NOT a function of muscle tissue?

Accepted Answer

Storing calcium in the blood plasma

Question 6

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 7

What is the functional role of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

Storing and releasing calcium ions during muscle contraction

Question 8

Which of the following correctly matches the sarcomere region with its description?

Accepted Answer

H-zone: Contains only thick filaments

Question 9

According to the sliding filament model, what happens to the I-band during muscle contraction?

Accepted Answer

It shortens as thin filaments slide past thick filaments.

Question 10

Which event occurs at the neuromuscular junction to initiate muscle contraction?

Accepted Answer

Release of acetylcholine from the motor neuron, binding to receptors on the sarcolemma.

Question 11

Which sequence correctly describes the events of excitation-contraction coupling?

Accepted Answer

Action potential travels along sarcolemma → calcium released from sarcoplasmic reticulum → troponin binds calcium → tropomyosin exposes binding sites → cross-bridge formation

Question 12

Which step is necessary for muscle relaxation after contraction?

Accepted Answer

Calcium ions are actively transported back into the sarcoplasmic reticulum.

Question 13

Which of the following best describes the contraction of smooth muscle compared to skeletal muscle?

Accepted Answer

Smooth muscle contraction is involuntary and can be sustained for longer periods.

Question 14

A patient is experiencing muscle weakness due to a defect in the acetylcholine receptors at the neuromuscular junction. Which process is most directly affected?

Accepted Answer

Generation of an action potential in the sarcolemma

Question 15

Which of the following is true regarding cardiac muscle contraction?

Accepted Answer

It is initiated by pacemaker cells and can be modulated by the autonomic nervous system.

Question 16

During the cross-bridge cycle, what event causes the myosin head to detach from actin?

Accepted Answer

Binding of ATP to the myosin head

Question 17

Which of the following best describes the role of T tubules in skeletal muscle fibers?

Accepted Answer

They transmit action potentials deep into the muscle fiber.

Question 18

If the sarcolemma is damaged and cannot repolarize, what is the most likely consequence?

Accepted Answer

The muscle fiber will remain in a contracted state due to continuous depolarization.

Question 19

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

Presence of intercalated discs for synchronized contraction

Study Guide: Joints and Muscle Tissue (Chapters 8-9)

Study Guide - Practice Questions

Study Guide - Flashcards