$$\text{Mechanical Advantage} = \frac{\text{Effort Arm}}{\text{Resistance Arm}}$$

Question 1

Which structural feature distinguishes synovial joints from fibrous and cartilaginous joints?

Accepted Answer

Presence of a fluid-filled synovial cavity

Question 2

A soccer player sustains a knee injury after twisting and hyperextending the leg. Which ligament is most likely damaged?

Accepted Answer

Anterior cruciate ligament (ACL)

Question 3

Which movement turns the palm of the hand to face posteriorly?

Accepted Answer

Pronation

Question 4

During sarcomere contraction, which band remains unchanged in length?

Accepted Answer

A band

Question 5

Which protein blocks the myosin-binding sites on actin in resting muscle?

Accepted Answer

Tropomyosin

Question 6

A muscle fiber is stimulated and contracts, but its length does not change. What type of contraction is this?

Accepted Answer

Isometric

Question 7

Which metabolic pathway produces the most ATP for prolonged, endurance activities?

Accepted Answer

Aerobic cellular respiration (oxidative phosphorylation)

Question 8

What is the primary function of the rotator cuff muscles at the shoulder joint?

Accepted Answer

To stabilize the humeral head in the glenoid cavity during movement

Question 9

Which of the following best describes a third-class lever in the human body?

Accepted Answer

The effort is between the fulcrum and the load

Question 10

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 11

During excitation-contraction coupling, which ion enters the muscle cell to initiate depolarization?

Accepted Answer

Sodium ($$Na^+)$$

Question 12

Which muscle fiber type is best suited for endurance activities and is characterized by high myoglobin and many mitochondria?

Accepted Answer

Type I (Slow Oxidative)

Question 13

What causes rigor mortis after death?

Accepted Answer

Depletion of ATP prevents myosin heads from detaching from actin

Question 14

Which of the following is a real-life example of a second-class lever in the human body?

Accepted Answer

Standing on tiptoes

Question 15

Which structure deepens the glenoid cavity and helps stabilize the shoulder joint?

Accepted Answer

Glenoid labrum

Question 16

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

Accepted Answer

Calcification

Question 17

A triad in skeletal muscle consists of:

Accepted Answer

One T-tubule and two terminal cisternae

Question 18

Which equation best represents the mechanical advantage of a lever system?

Accepted Answer

$$	ext{Mechanical Advantage} = \frac{	ext{Effort Arm}}{	ext{Resistance Arm}}$$

Question 19

Which event occurs first at the neuromuscular junction during muscle contraction?

Accepted Answer

Action potential arrives at the axon terminal

Question 20

Which muscle arrangement is characterized by fibers inserting on both sides of a central tendon, as seen in the rectus femoris?

Accepted Answer

Bipennate

Step-by-Step Study Guidance for Joints & Muscles (Anatomy & Physiology)

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