Q: A weightlifter is performing a biceps curl. Which equation best represents the torque ($$\tau) $$produced at the elbow joint if the force ($$F) $$applied by the biceps is 200 N and the distance ($$r) $$from the elbow joint to the point of force application is 0.04 m?

$$\tau = F \times r = 200 \times 0.04 = 8\ \mathrm{N \cdot m}$$

Question 1

Which muscle is primarily responsible for closing the jaw and elevating the mandible during chewing?

Accepted Answer

Masseter

Question 2

A patient is unable to flex their forearm at the elbow after an injury. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Question 3

Which muscle is responsible for dorsiflexion of the foot, such as when you lift your toes toward your shin?

Accepted Answer

Tibialis anterior

Question 4

During a sit-up, which muscle is primarily responsible for flexing the vertebral column?

Accepted Answer

Rectus abdominis

Question 5

A soccer player kicks a ball, extending their knee. Which muscle group is primarily responsible for this action?

Accepted Answer

Quadriceps femoris group

Question 6

Which muscle is responsible for abduction of the arm, such as when raising your arm to the side?

Accepted Answer

Deltoid

Question 7

A patient presents with difficulty blinking and squinting. Which muscle is most likely affected?

Accepted Answer

Orbicularis oculi

Question 8

Which muscle is the main muscle of respiration, causing the thoracic cavity to expand during inspiration?

Accepted Answer

Diaphragm

Question 9

If a person cannot purse their lips or whistle, which muscle is most likely not functioning properly?

Accepted Answer

Orbicularis oris

Question 10

Which muscle group is responsible for extending the thigh and flexing the leg, such as when running?

Accepted Answer

Hamstring muscles

Question 11

A patient is unable to rotate their head to the opposite side or flex their neck forward. Which muscle is most likely injured?

Accepted Answer

Sternocleidomastoid

Question 12

Which muscle is responsible for adducting the arm, such as when bringing your arm toward your body?

Accepted Answer

Pectoralis major

Question 13

Which muscle is primarily responsible for plantar flexion of the foot, such as when standing on tiptoe?

Accepted Answer

Gastrocnemius

Question 14

A weightlifter is performing a biceps curl. Which equation best represents the torque ($$	au) $$produced at the elbow joint if the force ($$F) $$applied by the biceps is 200 N and the distance ($$r) $$from the elbow joint to the point of force application is 0.04 m?

Accepted Answer

$$	au = F 	imes r = 200 	imes 0.04 = 8\ \mathrm{N \cdot m}$$

Question 15

Which muscle is most responsible for powerful thigh extension, such as when climbing stairs?

Accepted Answer

Gluteus maximus

Question 16

A patient has difficulty extending their forearm at the elbow. Which muscle is most likely affected?

Accepted Answer

Triceps brachii

Question 17

Which muscle is responsible for flexing the leg and stabilizing the knee, and is part of the quadriceps femoris group?

Accepted Answer

Vastus lateralis

Question 18

A patient is unable to flatten their diaphragm during inspiration, leading to difficulty breathing. What is the physiological consequence of this impairment?

Accepted Answer

Reduced expansion of the thoracic cavity and decreased lung volume

Question 19

Which muscle is responsible for closing the eyes, such as during blinking or squinting?

Accepted Answer

Orbicularis oculi

Question 20

A runner experiences pain when flexing their foot upward (dorsiflexion). Which muscle is most likely strained?

Accepted Answer

Tibialis anterior

Muscles That Move the Head, Neck, Trunk, and Limbs: Anatomy & Physiology Study Notes

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