ch 10 muscular tissue

Which of the following muscle cells is considered voluntary?

skeletal

If you were examining some cells and observed the presence of intercalated discs, the type of muscle cells you would be looking at would be ________

cardiac

What kind of muscles lines the blood vessels?

smooth

ability to respond to chemicals released from nerve cells

excitability

ability to propagate electrical signals over membrane

conductivity

ability to shorten and generate force

contractility

ability to be stretched without damaging the tissue

extensibility

ability to return to original shape after being stretched

elasticity

surrounds the whole muscle

epimysium

surrounds bundles (fascicles) of 10-100 muscle cells

perimysium

separates individual muscle cells

endomysium

A tendon is an extension of which of the following?

endomysium, epimysium, and perimysium

muscle cell membrane

sarcolemma

In order for muscles to contract, they need calcium ions. Muscle cells have an organelle that stores the needed calcium ions. This organelle is called ________

sarcoplasmic reticulum

Myosin cross‐bridges are extensions of ________

myosin

The membrane around a muscle cell is called a ________

sarcolemma

The actin filaments are attached to the ________

z discs

The troponin/tropomyosin complex is associated directly with which of the following filaments?

actin

what type of muscle attached to bone, skin, or fascia?

skeletal

dense irregular connective tissue around muscle

deep fascia

each ____ muscle is supplied by a nerve, artery, and two veins

skeletal

each motor neuron supplies multiple ________

muscle cells

muscle growth is a result of what?

cellular enlargement

_____ anchors thick filaments to the M line and the Z disc

titan

_____ is an inelastic protein that helps align the thin filaments

nebulin

______ links thin filaments to sarcolemma and transmits the tension generated to the tendon

dystrophin

wasting away of muscles; caused by disuse or severing of the nerve supply

atrophy

increase in the diameter of muscle fibers, resulting from very forceful, repetitive muscular activity and an increase in myofibrils, SR, and mitochondria

hypertrophy

thick and think filaments overlap each other in a pattern that creates _______

striations

Myofibrils are composed of individual:

myofilaments

Muscles are held in place and covered by:

fascia

The functional unit of a muscle is the:

sarcomere

Thin filaments within a muscle fiber are called:

actin

This substance will cross the neuromuscular junction to communicate with individual muscle fibers:

acetylcholine

The energy source for muscle contractions is:

ATP

The A band in a myofibril is an area of:

thick filaments

A sarcomere is defined as the section of fiber between:

z lines

Tendons connect:

muscles to bones

The connective tissue that surrounds individual fibers is:

endomysium