Muscles of the Human Body

How many different muscles are there in the human body?

• About 200

• Over 650

• Approximately 500

• Less than 300

What are the three types of muscle?

• Skeletal

• Smooth

• Cardiac

• Rough

• Pulmonary

Which type of muscle is striated and voluntary?

• Cardiac muscle

• Smooth muscle

• Skeletal muscle

• Involuntary muscle

What is the term for the cell membrane of a muscle cell?

• Sarcoplasm

• Sarcolemma

• Myofibril

• Fascia

What is the term for the functional unit of skeletal muscles?

• tendon
• sarcomere
• myosin

• sarcoplasm

What are the two myofilaments that slide over one another to shorten the muscle fiber length during a muscle contraction?

• actin

• myosin

• sarcolemma

• acetylcholine

Where is cardiac muscle found?

• In the walls of blood vessels

• In the heart

• In the stomach

• In the skeletal system

True or false:

Cardiac muscle cells are striated, branched, and involuntary.

• true

• false

Where are smooth muscles located?

• Attached to the appendicular skeleton.

• Located in the heart.

• Located in the walls of tubular structures and hollow organs.

• Attached to the bones of the skull.

Which muscle antagonizes the biceps when a person flexes?

• Triceps

• Quadriceps

• Subscapularis

• Deltoid