Physiology: The Muscles That Move Us

Which type of muscle is found in hollow organs?

• skeletal

• smooth

• cardiac

• striated

____________ are surrounded by perimysium and are made up of individual muscle cells.

• muscle bellies

• fasiculi

• muscle fibres

Another name for the cell membrane of a muscle fibre is the plasmalemma.

• True

• False

The ends of a sarcomere are called a __________.

• Z-disk

• H-zone

• A-bands

Myosin, a protein filament, is considered the __________ filament.

• thin

• thick

This covers myosin binding sites at rest, before calcium can help to move it.

• troponin

• tropomyosin

• actin

• titin

Titin is a myofilament that helps to prevent overstretching.

• True

• False

Which main neurotransmitter helps to pass an electrical signal from a neuron to a muscle fibre?

• glutamate

• serotonin

• acetylcholine

T-tubules help to bring electrical signals deep into the muscle fibres.

• True

• False

In muscle fibres, calcium is stored (and released from) the ____________ _____________ .

• sarcoplasmic reticulum

• mitochondrial network

• terminal buttons