Anatomy of Skeletal Muscle

Question 1

Sarcolemma

Answer 1

A plasma membrane that lies under the endomysium, a sheath of connective tissue that surrounds a muscle fibre

Question 1

Sarcoplasm

Answer 1

The muscle cell’s cytoplasm, which is contained by the sarcolemma.

Question 2

Sarcomeres

Answer 2

composed of two main protein filaments —actin and myosin. (dark and light bands alternating, making it look stripped)

Question 3

Sarcoplasmic reticulum (SR)

Answer 3

Network of channels in each muscle fibre that transport the electrochemical substances involved in muscle activation

Question 4

Sarcoplasmic reticulum (SR) function

Answer 4

a system of tubes and sacs in muscle cells. Its main job is to store and release calcium, which is needed for muscles to contract. When a muscle gets a signal to move, the SR releases calcium, making the muscle tighten. After the movement, the SR takes the calcium back in, and the muscle relaxes.

Question 5

Endomysium

Answer 5

This is the connective tissue that surrounds each individual muscle fiber.

Question 6

Perimysium

Answer 6

This connective tissue surrounds bundles of muscle fibers, which are called fascicles.

Question 7

Epimysium

Answer 7

This is the outer layer of connective tissue that covers the entire muscle. At both ends, it turns into a tendon to attach the muscle to a bone.