Question 1

Which of the following best describes the difference between the axial and appendicular skeletons?

Accepted Answer

The axial skeleton consists of bones that form the central axis of the body, such as the skull, vertebral column, and thoracic cage, while the appendicular skeleton consists of bones of the limbs and girdles.

Question 2

A patient presents with a herniated disc between the L4 and L5 vertebrae. Which landmark is most useful for identifying the affected region?

Accepted Answer

The iliac crest, which aligns with the L4 vertebra

Question 3

Which feature distinguishes the infant skull from the adult skull?

Accepted Answer

Presence of fontanelles, which are soft spots that allow for brain growth

Question 4

Which bone is NOT part of the upper limb?

Accepted Answer

Femur

Question 5

A synovial joint is characterized by which of the following features?

Accepted Answer

Presence of a joint cavity filled with synovial fluid, articular cartilage, and a capsule

Question 6

Which type of joint allows for the greatest range of motion?

Accepted Answer

Ball-and-socket joint

Question 7

In a biceps curl, which lever system is being used?

Accepted Answer

Third-class lever, where the effort is between the fulcrum and load

Question 8

Which muscle is the primary agonist during elbow flexion?

Accepted Answer

Biceps brachii

Question 9

Which statement about muscle origins and insertions is correct?

Accepted Answer

The origin is typically proximal and less movable, while the insertion is distal and more movable.

Question 10

Which muscle is NOT part of the rotator cuff?

Accepted Answer

Teres major

Question 11

Which organizational level of skeletal muscle tissue is correctly matched with its description?

Accepted Answer

Muscle fiber: single muscle cell

Question 12

According to the sliding filament theory, which event occurs during muscle contraction?

Accepted Answer

Myosin heads bind to actin and pull the filaments, causing sarcomere shortening

Question 13

Which equation best represents the relationship between muscle force ($$F$$), lever arm length ($$r$$), and torque ($$	au) in $$human movement?

Accepted Answer

$$	au = F 	imes r$$

Question 14

During a muscle contraction, which sequence correctly describes the events at the neuromuscular junction?

Accepted Answer

Acetylcholine is released, binds to receptors, sodium enters the muscle cell, and an action potential is generated

Question 15

Which factor does NOT directly affect the force generated by a skeletal muscle?

Accepted Answer

Amount of synovial fluid in the joint

Question 16

A marathon runner's muscles adapt to prolonged activity by increasing which of the following?

Accepted Answer

Mitochondrial density and capillary supply

Question 17

Which scenario best illustrates muscle atrophy due to inactivity?

Accepted Answer

A patient loses muscle mass after being immobilized in a cast for several weeks

Question 18

If a muscle's origin is on the scapula and its insertion is on the humerus, which type of movement is most likely produced?

Accepted Answer

Abduction or rotation of the shoulder

Question 19

Which of the following is a real-life example of a pivot joint?

Accepted Answer

The atlantoaxial joint between the first and second cervical vertebrae, allowing head rotation

Question 20

Which muscle action is responsible for lowering the forearm during a triceps extension exercise?

Accepted Answer

Extension

Exam 3 Study Guide: Skeletal System, Joints, and Muscular System

Study Guide - Practice Questions

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