Q: Which equation best represents the sliding filament theory of muscle contraction?

$$ \text{Actin} + \text{Myosin} \rightarrow \text{Actomyosin complex} $$

Q: Which of the following equations best represents the energy source for muscle contraction?

$$ \text{ATP} \rightarrow \text{ADP} + \text{P}_i + \text{Energy} $$

Question 1

Which of the following best describes the structural difference between skeletal, cardiac, and smooth muscle tissue as seen under the microscope?

Accepted Answer

Skeletal muscle is striated and multinucleated, cardiac muscle is striated with intercalated discs, and smooth muscle is non-striated with a single nucleus.

Question 2

Which equation best represents the sliding filament theory of muscle contraction?

Accepted Answer

$$ 	ext{Actin} + 	ext{Myosin} ightarrow 	ext{Actomyosin complex} $$

Question 3

A patient is unable to smile or frown due to nerve damage. Which muscle group is most likely affected?

Accepted Answer

Facial muscles, including the orbicularis oris and zygomaticus

Question 4

Which structure is responsible for transmitting the action potential from a motor neuron to a skeletal muscle fiber?

Accepted Answer

Neuromuscular junction

Question 5

During muscle contraction, which band of the sarcomere shortens?

Accepted Answer

I band

Question 6

Which connective tissue structure attaches muscle to bone?

Accepted Answer

Tendon

Question 7

A patient presents with difficulty chewing. Which muscle is most likely impaired?

Accepted Answer

Masseter

Question 8

Which muscle is primarily responsible for inspiration during quiet breathing?

Accepted Answer

Diaphragm

Question 9

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

Stores and releases calcium ions

Question 10

Which muscle is responsible for flexion of the forearm at the elbow?

Accepted Answer

Biceps brachii

Question 11

Which muscle group is located along the vertebral column and is responsible for maintaining posture?

Accepted Answer

Erector spinae

Question 12

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

Presence of intercalated discs

Question 13

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

Accepted Answer

Deltoid

Question 14

A patient has a tear in the abdominal aponeurosis. Which muscle group is most likely affected?

Accepted Answer

Abdominal muscles (e.g., rectus abdominis, external oblique)

Question 15

Which of the following best describes the role of acetylcholine at the neuromuscular junction?

Accepted Answer

It acts as a neurotransmitter to initiate muscle contraction.

Question 16

Which muscle is responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 17

Which of the following equations best represents the energy source for muscle contraction?

Accepted Answer

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

Question 18

Which muscle is primarily responsible for extension of the forearm at the elbow?

Accepted Answer

Triceps brachii

Question 19

Which of the following muscles is part of the quadriceps femoris group and is responsible for knee extension?

Accepted Answer

Vastus lateralis

Question 20

A patient is unable to dorsiflex the foot. Which muscle is most likely weakened?

Accepted Answer

Tibialis anterior

Muscle Tissue and Muscular System: Axial and Appendicular Muscles

Study Guide - Practice Questions

Study Guide - Flashcards