$$\text{Actin} + \text{Myosin} + Ca$$^{2+}$$ + ATP \rightarrow \text{Contraction}$$

Question 1

Which of the following best describes the function of articular cartilage in synovial joints?

Accepted Answer

It reduces friction and absorbs shock between articulating bones.

Question 2

Which type of bone cell is primarily responsible for bone resorption during remodeling?

Accepted Answer

Osteoclast

Question 3

A patient presents with a greenstick fracture. Which age group is this type of fracture most commonly seen in, and why?

Accepted Answer

Children, because their bones are more flexible and less mineralized.

Question 4

Which equation correctly represents the relationship between calcium homeostasis and parathyroid hormone (PTH) secretion?

Accepted Answer

$$PTH \uparrow \Rightarrow [Ca$$^{2+}$$]_{blood} \uparrow$$

Question 5

Which of the following best describes the process of endochondral ossification?

Accepted Answer

Bone replaces a pre-existing hyaline cartilage model.

Question 6

A patient with vitamin D deficiency is likely to experience which of the following effects on bone tissue?

Accepted Answer

Decreased bone mineralization leading to conditions such as rickets or osteomalacia.

Question 7

Which of the following is NOT a function of the skeletal system?

Accepted Answer

Regulation of body temperature.

Question 8

During muscle contraction, which protein does calcium bind to in skeletal muscle fibers?

Accepted Answer

Troponin

Question 9

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

Accepted Answer

Isotonic contractions involve muscle length change with movement; isometric contractions involve tension without length change.

Question 10

Which of the following equations correctly represents the sliding filament model of muscle contraction?

Accepted Answer

$$	ext{Actin} + 	ext{Myosin} + Ca$$^{2+}$$ + ATP ightarrow 	ext{Contraction}$$

Question 11

Which joint type allows for the greatest range of motion?

Accepted Answer

Ball-and-socket joint

Question 12

Which of the following best explains why elderly individuals are more susceptible to osteoporosis?

Accepted Answer

Bone resorption exceeds bone formation due to decreased sex hormone levels.

Question 13

Which of the following movements is described by the equation $$	ext{Flexion} = 	ext{Decrease in joint angle}$$?

Accepted Answer

Flexion

Question 14

Which structure in a long bone is responsible for longitudinal growth during development?

Accepted Answer

Epiphyseal plate

Question 15

Which of the following best describes the role of ATP in muscle contraction?

Accepted Answer

ATP is required for myosin head detachment from actin during cross-bridge cycling.

Question 16

Which of the following is a characteristic of compact bone compared to spongy bone?

Accepted Answer

Has a dense structure with osteons (Haversian systems).

Question 17

Which of the following best describes the function of synovial fluid?

Accepted Answer

It provides nutrients to articular cartilage and reduces friction in the joint.

Question 18

Which of the following is the correct sequence of events in the excitation-contraction coupling of skeletal muscle?

Accepted Answer

Action potential → Calcium release → Troponin activation → Cross-bridge formation

Question 19

Which of the following best explains the difference between a tendon and a ligament?

Accepted Answer

Tendons connect muscle to bone; ligaments connect bone to bone.

Skeletal Tissues, Joints, and Muscle Tissue: Study Guide

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