Muscle Anatomy Quiz

__________ attach muscles to bones.

• Ligaments

• Tendons

• Fascicles

• Joints

Answer explanation

Tendons are the connective tissues that attach muscles to bones, enabling movement. Ligaments connect bones to other bones, fascicles are bundles of muscle fibers, and joints are the points where bones meet.

All types of muscle are striated.

• True

• False

Answer explanation

Not all muscle types are striated. Skeletal and cardiac muscles are striated, while smooth muscle is not. Therefore, the statement is false.

Which of the following types of muscle is involuntary?

• skeletal muscle

• cardiac muscle

• smooth muscle

Answer explanation

Smooth muscle is involuntary, meaning it operates without conscious control. In contrast, skeletal muscle is voluntary, and cardiac muscle, while involuntary, is not the correct answer here as the question specifically asks for smooth muscle.

The attachment of a muscle tendon to a stationary bone is known as the

• origin

• suture

• insertion

• joint

Answer explanation

The attachment of a muscle tendon to a stationary bone is called the origin. This is where the muscle begins, while the insertion is where it attaches to the moving bone.

The moveable attachment of the distal end of a muscle which produces changes in shape or skeletal movement when the muscle contracts is known as the

• origin

• suture

• insertion

• joint

Answer explanation

The insertion is the moveable attachment of a muscle that, when contracted, causes movement or shape change in the skeleton. In contrast, the origin is the fixed attachment, making insertion the correct answer.

What is a "pulled" muscle?

• A muscle that has been dislocated from its original position

• A muscle that has experienced a partial tear or strain due to overuse or sudden movement

• A muscle that has become permanently shortened due to lack of use

• A muscle that has been surgically removed and reattached

Answer explanation

A "pulled" muscle refers to a muscle that has experienced a partial tear or strain, often due to overuse or sudden movement, making this the correct choice. The other options describe different conditions.

Muscles only contract, or get shorter. They do not extend and get longer.

• True

• False

Answer explanation

The statement is false because while muscles contract to shorten, they can also be lengthened by the action of opposing muscles. This is known as muscle relaxation, allowing them to return to their original length.

What is the primary difference between a flexor and an extensor muscle?

• Flexor muscles are located in the legs, while extensor muscles are in the arms.

• Flexor muscles only work during rest, while extensor muscles only work during activity.

• Flexor muscles generate heat, while extensor muscles cool the body.

• Flexor muscles contract to bend a joint, while extensor muscles contract to straighten a joint.

Answer explanation

The primary difference is that flexor muscles contract to bend a joint, while extensor muscles contract to straighten a joint. This distinction is fundamental to understanding muscle function in movement.

What is muscle fatigue?

• A decrease in a muscle’s ability to generate force after prolonged activity.

• A temporary loss of muscle strength due to overtraining.

• Permanent muscle damage caused by lack of oxygen.

• The stiffening of the muscles after intense exercise.

Answer explanation

Muscle fatigue is defined as a decrease in a muscle’s ability to generate force after prolonged activity. This occurs due to various factors, including energy depletion and accumulation of metabolic byproducts.

Which of the following contributes to muscle fatigue?

• Overproduction of energy in the muscle cells

• Build-up of lactic acid in muscle tissues

• High levels of protein synthesis

• Overproduction of energy in the muscle cells

Answer explanation

Muscle fatigue is primarily caused by the build-up of lactic acid in muscle tissues during intense exercise, leading to decreased performance. Overproduction of energy and high protein synthesis do not directly cause fatigue.

Tags

NGSS.HS-LS2-3