Question 1

Which type of muscle tissue is shown in the first image (top left), characterized by long, cylindrical, multinucleated cells with visible striations?

Accepted Answer

Skeletal muscle

Question 2

The second image (top row, middle) shows a tissue with spindle-shaped cells and no visible striations. Where in the body would you most likely find this tissue?

Accepted Answer

In the walls of the intestines

Question 3

The third image (top row, right) shows muscle tissue with striations and branching fibers. Which feature distinguishes this tissue from skeletal muscle?

Accepted Answer

Presence of intercalated discs

Question 4

In the fourth image, the diagram illustrates the connection between the nervous system and muscle fibers. What is the functional unit called that consists of a motor neuron and all the muscle fibers it innervates?

Accepted Answer

Motor unit

Question 5

The fifth image shows the sliding filament model of muscle contraction. Which two proteins interact to produce contraction?

Accepted Answer

Actin and myosin

Question 6

The sixth image shows the biceps and triceps muscles. When the biceps contracts to flex the elbow, what role does the triceps play?

Accepted Answer

Antagonist

Question 7

The seventh and eighth images show a sarcomere at rest and during contraction. What happens to the distance between Z discs during contraction?

Accepted Answer

It decreases

Question 8

The ninth image shows a muscle tissue with striations and centrally located nuclei. Which muscle type is this?

Accepted Answer

Cardiac muscle

Question 9

The tenth image is of a human heart. Which muscle tissue is found in this organ?

Accepted Answer

Cardiac muscle

Question 10

The eleventh image shows the wall of the digestive tract with two muscle layers. What is the main function of these smooth muscle layers?

Accepted Answer

Propelling food through peristalsis

Question 11

The thirteenth image shows a cross-section of a muscle. Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 12

The fourteenth image shows a muscle fascicle. What is the functional significance of grouping muscle fibers into fascicles?

Accepted Answer

It allows for independent control of groups of fibers

Question 13

The fifteenth image shows a highly organized structure with repeating units. What is the name of the contractile unit of a muscle fiber?

Accepted Answer

Sarcomere

Question 14

The sixteenth image shows the middle ear. Which muscle is the smallest skeletal muscle in the human body and is found here?

Accepted Answer

Stapedius

Question 15

The seventeenth image shows the sartorius muscle. What is unique about this muscle compared to others in the human body?

Accepted Answer

It is the longest muscle

Question 16

The eighteenth image shows a muscle cross-section with blood vessels. What is the primary function of arteries within muscle tissue?

Accepted Answer

Provide oxygen and nutrients

Question 17

The nineteenth image shows a neuromuscular junction. What is the role of the neuromuscular junction?

Accepted Answer

To transmit nerve impulses to muscle fibers

Question 18

The twentieth image shows different muscle shapes. Which muscle arrangement allows for the greatest shortening during contraction?

Accepted Answer

Parallel

Question 19

The twenty-first image shows a circular muscle. What is the primary function of circular muscles?

Accepted Answer

To constrict or close an orifice

Question 20

The twenty-second image shows a muscle attachment. What is the difference between the origin and insertion of a muscle?

Accepted Answer

Origin does not move during contraction, insertion moves

Muscle Tissue Structure and Function: ANP Study Guide

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