Anatomy & Phys - Muscular System Test Review

Number 1 on this diagram is labeling this overall structure.  This structure inside your muscle cells is called a

• myofiber

• myafilament

• sarcomere

• Z-line

With number labels the light band (I-band)?

• 2

• 5

• 7

• 3

Which number represents the dark band?

• 1

• 5

• 6

• 8

Which number is labeling the Z - line?

• 1

• 2

• 5

• 4

Which of these structure form the visible striations that are seen in skeletal muscle?

• I-band

• A-band

• Z-line

• sarcomere

What is the sarcolemma?

• structures that conduct action potentials into the muscle cells

• specialized plasma membrane of muscle cells

• specialized calcium storage in muscle cells

• proteins that pull on each other to contract

What is a sarcomere?

• Protein that releases calcium to start contractions

• protein that blocks actin when muscles are at rest

• specialized endoplasmic reticulum of muscle cells

• Contractile unit of a muscle cell

What is actin?

• Protein that makes muscle cells more permeable to calcium

• Thick myofilament that has heads that pull to cause contractions

• A neurotransmitter released by motor neurons

• Thin myofilament, has binding sites for myosin to bind to during contractions

What is myosin?

• Protein that binds with calcium to initiate muscle contractions.

• Zig zag protein that separates adjacent sarcomeres

• Thick myofilament, has heads that attach to and pull on actin during contractions

• Thin myofilament that is pulled on during contractions

What is acetylcholine?

• Acetylcholine is a neurotransmitter released by motor neurons to stimulate contractions

• Acetylcholine is a vitamin needed for muscles to contract

• Acetylcholine is a type of protein found inside muscle cells.

• Acetylcholine is a hormone released that stimulates muscle growth.