Muscle Flexation and Extension

What is muscle contraction?

• Muscle contraction is the process in which muscle fibers only generate tension but do not shorten or produce movement.

• Muscle contraction is the process in which muscle fibers do not generate tension and remain in a static position.

• Muscle contraction is the process in which muscle fibers relax and lengthen, resulting in movement or force generation.

• Muscle contraction is the process in which muscle fibers generate tension and shorten, resulting in movement or force generation.

Tags

NGSS.MS-LS1-3

What is muscle relaxation?

• The process of increasing tension and stiffness in the muscles.

• The process of stretching and elongating the muscles.

• The process of contracting and tightening the muscles.

• The process of releasing tension and reducing muscle stiffness in the body.

Name one flexor muscle in the human body.

• triceps brachii

• deltoid

• quadriceps femoris

• biceps brachii

Name one extensor muscle in the human body.

• biceps brachii muscle

• hamstring muscle

• pectoralis major muscle

• triceps brachii muscle

What is excitability of a muscle?

• Ability to respond to stimuli and generate electrical impulses.

• Ability to produce heat

• Ability to store and release energy

• Ability to contract and relax

What happens during muscle contraction?

• Muscle fibers lengthen and generate tension.

• Muscle fibers do not generate tension during contraction.

• Muscle fibers shorten and generate tension.

• Muscle fibers generate tension but do not shorten.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

What happens during muscle relaxation?

• The tension in the muscles decreases and they become less contracted and more flexible.

• The tension in the muscles increases and they become more contracted and rigid.

• The muscles become completely immobile and unable to move.

• The muscles become stronger and more powerful.

Give an example of a flexor muscle movement.

• Extending the knee

• Bending the elbow

• Rotating the shoulder

• Straightening the elbow

Give an example of an extensor muscle movement.

• Straightening the arm at the elbow joint

• Bending the arm at the elbow joint

• Flexing the leg at the knee joint

• Curling the fingers

How does excitability of a muscle affect its function?

• Excitability of a muscle causes it to relax and inhibit movement.

• Excitability of a muscle allows it to contract and produce movement.

• Excitability of a muscle has no effect on its function.

• Excitability of a muscle leads to decreased flexibility and range of motion.