Question 1

Which structure in the first image represents a single muscle fiber, and what is its primary function?

Accepted Answer

The smallest circular unit labeled, responsible for generating force through contraction.

Question 2

In the second image, what is the significance of the 'origin' and 'insertion' points for muscle movement?

Accepted Answer

The origin is the fixed attachment, while the insertion moves with contraction, allowing the muscle to produce movement at a joint.

Question 3

Referencing the third image, which band or zone shortens during muscle contraction?

Accepted Answer

The H zone

Question 4

Which of the following best describes the relationship between actin and myosin during muscle contraction?

Accepted Answer

Myosin heads bind to actin, forming cross-bridges and pulling actin filaments toward the M line.

Question 5

A patient is unable to move an object despite maximal effort, but their muscle length does not change. What type of contraction is occurring?

Accepted Answer

Isometric contraction

Question 6

Which equation best represents the relationship between muscle tension (T), load (L), and movement in isotonic contractions?

Accepted Answer

$$T \u003e L$$

Question 7

During a biceps curl, which muscle action is primarily responsible for lifting the weight?

Accepted Answer

Concentric contraction of the biceps brachii

Question 8

Which of the following best describes muscle fatigue?

Accepted Answer

A condition in which a muscle is unable to generate force

Question 9

What is the minimum stimulus required to initiate a muscle fiber contraction called?

Accepted Answer

Threshold stimulus

Question 10

Which structure in the spinal cord cross-section is responsible for transmitting motor signals from the brain to the body?

Accepted Answer

Ventral (anterior) horn

Question 11

A patient presents with difficulty understanding spoken language but can speak fluently. Which cerebral cortex area is most likely affected?

Accepted Answer

Wernicke’s area

Question 12

Which cranial nerve is responsible for vision and is classified as sensory?

Accepted Answer

Optic nerve (II)

Question 13

During the chicken dissection lab, which structure would you expect to find as the main contractile unit of muscle tissue?

Accepted Answer

Sarcomere

Question 14

Which of the following best describes the function of troponin in muscle contraction?

Accepted Answer

It binds calcium ions, causing a conformational change that moves tropomyosin and exposes myosin-binding sites on actin.

Question 15

If a muscle is stretched beyond its optimal length, what happens to its ability to generate tension according to the length-tension relationship?

Accepted Answer

Tension decreases because there is less overlap between actin and myosin filaments.

Question 16

Which of the following is true regarding motor unit recruitment?

Accepted Answer

It increases the strength of muscle contraction by activating more motor units.

Question 17

Which muscle listed below has its origin on the clavicle and sternum and inserts on the humerus, and is responsible for flexion, adduction, and medial rotation of the arm?

Accepted Answer

Pectoralis major

Question 18

Which of the following best describes the action of the deltoid muscle?

Accepted Answer

Abduction of the arm at the shoulder

Question 19

Which structure in the cow eye is responsible for focusing light onto the retina?

Accepted Answer

Lens

Question 20

A patient has difficulty producing speech but can understand language. Which area of the brain is most likely damaged?

Accepted Answer

Broca’s area

BIO 201 Lab Final Study Guide: Muscles, Nervous System, and Special Senses

Study Guide - Practice Questions

Study Guide - Flashcards