Question 1

Which of the following best describes the process by which most long bones develop during fetal growth?

Accepted Answer

Endochondral ossification, where bone replaces a hyaline cartilage model.

Question 2

A patient presents with a fracture through the epiphyseal plate of the femur. Why is this location clinically significant?

Accepted Answer

It can disrupt future longitudinal bone growth, potentially causing deformity.

Question 3

Which bone cell is primarily responsible for bone resorption, and what is the effect of parathyroid hormone (PTH) on this cell?

Accepted Answer

Osteoclast; PTH increases its activity, raising blood calcium levels.

Question 4

During muscle contraction, calcium ions bind to which protein, and what is the immediate result?

Accepted Answer

Troponin; tropomyosin shifts to expose myosin-binding sites on actin.

Question 5

Which formula correctly represents the relationship between force, load, and muscle contraction in an isotonic contraction?

Accepted Answer

$$ F_{muscle} \u003e F_{load} $$

Question 6

A person stands on tiptoe and then pulls their toes toward their shin. Which movements are being demonstrated?

Accepted Answer

Plantar flexion followed by dorsiflexion.

Question 7

Which of the following is a correct sequence for the stages of bone fracture healing?

Accepted Answer

Hematoma formation → Fibrocartilaginous callus → Bony callus → Bone remodeling

Question 8

Which muscle is the primary agonist for elbow flexion during a biceps curl, and which muscle acts as the antagonist?

Accepted Answer

Brachialis and biceps brachii are agonists; triceps brachii is antagonist.

Question 9

Which of the following best explains why spongy bone can be strong despite being less dense than compact bone?

Accepted Answer

Trabeculae are oriented along lines of stress, providing strength without excessive weight.

Question 10

Which muscle arrangement is most efficient for generating force, and why?

Accepted Answer

Pennate arrangement, because fibers attach obliquely to the tendon, increasing cross-sectional area.

Question 11

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

Accepted Answer

Production of hormones.

Question 12

A patient with vitamin D deficiency is most likely to develop which bone disorder, and what is the underlying cause?

Accepted Answer

Rickets or osteomalacia; inadequate mineralization of bone matrix.

Question 13

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

Accepted Answer

Ligament connects bone to bone; tendon connects muscle to bone.

Question 14

Which formula represents the relationship between ATP hydrolysis and muscle contraction?

Accepted Answer

$$ 	ext{ATP} ightarrow 	ext{ADP} + 	ext{P}_i + 	ext{energy} $$

Question 15

Which muscle is primarily responsible for abducting the arm at the shoulder joint?

Accepted Answer

Deltoid (especially middle fibers).

Question 16

Which movement occurs when the sole of the foot is turned inward?

Accepted Answer

Inversion.

Question 17

Which of the following best describes the action of the sternocleidomastoid muscle when acting unilaterally?

Accepted Answer

Rotates the head to the opposite side and laterally flexes toward the same side.

Question 18

Which of the following is a correct anatomical description of the tibia?

Accepted Answer

Medial lower-leg bone that bears most body weight.

Question 19

Which muscle group is primarily responsible for extending the knee, and what are its components?

Accepted Answer

Quadriceps femoris: rectus femoris, vastus lateralis, vastus medialis, vastus intermedius.

Question 20

Which of the following best describes the sliding filament mechanism of muscle contraction?

Accepted Answer

Actin filaments slide past myosin, shortening the sarcomere without changing the length of the filaments.

Anatomy & Physiology I: Chapters 6–10 Study Guidance

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