Question 1

Which of the following best describes the primary function of the subcutaneous layer in the integumentary system?

Accepted Answer

It stores energy, insulates the body, and anchors the skin to underlying structures.

Question 2

A patient presents with a deep laceration that penetrates through the epidermis and into the dermis. Which of the following layers is most directly responsible for the majority of the wound's healing process?

Accepted Answer

Papillary layer of the dermis

Question 3

Which of the following correctly matches the function to the correct bone cell type involved in bone formation?

Accepted Answer

Osteoblasts - deposit calcium salts and build new bone matrix

Question 4

A 10-year-old child and a 40-year-old adult both sustain a fracture to the femur. Which of the following best explains why the child’s bone heals faster than the adult’s?

Accepted Answer

Children have a more active periosteum and greater blood supply to bones, promoting faster healing.

Question 5

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions ($$Ca^{2+}) $$necessary for muscle contraction.

Question 6

During a marathon, an athlete experiences muscle fatigue. Which of the following is the most significant physiological factor contributing to this fatigue?

Accepted Answer

Accumulation of lactic acid in the muscle fibers

Question 7

A patient is unable to abduct their arm at the shoulder joint. Which type of synovial joint and movement is most likely impaired?

Accepted Answer

Ball-and-socket joint; abduction

Question 8

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

Accepted Answer

Isometric contractions generate tension without changing muscle length, while isotonic contractions change muscle length with constant tension.

Question 9

Which of the following is a correct sequence of events in the contraction of a skeletal muscle fiber?

Accepted Answer

Action potential travels down T-tubules → release of $$Ca^{2+}$$ → troponin binds $$Ca^{2+}$$ → tropomyosin shifts → myosin binds actin

Question 10

A patient with osteoporosis is at increased risk for bone fractures. Which of the following best explains the physiological basis for this increased risk?

Accepted Answer

Osteoporosis decreases bone mass and density, weakening the bone structure.

Question 11

Which of the following best describes the function of the stratum basale in the epidermis?

Accepted Answer

It is the site of active cell division, producing new keratinocytes.

Question 12

Which of the following is a function of the papillary layer of the dermis?

Accepted Answer

It contains capillaries that supply nutrients to the epidermis.

Question 13

Which of the following best describes the role of parathyroid hormone ($$PTH) in $$calcium homeostasis?

Accepted Answer

$$PTH$$ increases blood calcium levels by stimulating osteoclasts to resorb bone.

Question 14

A patient is diagnosed with a torn anterior cruciate ligament (ACL) in the knee. Which type of joint and movement is most affected?

Accepted Answer

Hinge joint; flexion and extension

Question 15

Which of the following best explains why the skin is able to help regulate body temperature?

Accepted Answer

The dermis contains blood vessels that can dilate or constrict to regulate heat loss.

Question 16

Which of the following is a correct example of a synovial joint and its movement?

Accepted Answer

Hinge joint; flexion and extension

Question 17

A patient is unable to dorsiflex their foot after a car accident. Which muscle group and action are most likely impaired?

Accepted Answer

Tibialis anterior; dorsiflexion

Question 18

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

Accepted Answer

The axial skeleton consists of the skull, vertebral column, and rib cage, while the appendicular skeleton includes the limbs and girdles.

Question 19

Which of the following best explains the sliding filament theory of muscle contraction?

Accepted Answer

Myosin heads bind to actin and pull the actin filaments toward the center of the sarcomere, shortening the muscle.

Anatomy & Physiology: Integumentary, Skeletal, and Muscular Systems – Learning Outcomes and Study Guide

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