Calcium is stored in the...

Sarcoplasmic Reticulum of the Muscle Cell

The Sarcolemma of the Muscle Cell

The interstitial space outside the muscle cell near the pre-synaptic terminal.

Which of the following comes before the others in muscle contraction?

Myosin globular head 'uncoils' releasing stored energy.

Cross Bridges are formed between actin and myosin

Tropomyosin changes shape (conformation) to expose myosin binding sites.

What is a crossbridge?

Where the calcium crosses into the cytoplasm

Where calcium binds with troponin

Where titin and myosin are connected

What is the role of ATP in muscle contraction?

It provides the energy for the power stroke of the myosin cross bridge.

It acts as a neurotransmitter to initiate muscle contraction.

It is the main component of the sarcolemma.

It is responsible for the release of calcium ions.

What happens to the muscle when the concentration of calcium ions decreases?

The muscle contracts more forcefully.

The muscle begins to twitch uncontrollably.

What is the role of the sarcoplasmic reticulum in muscle contraction?

It stores and releases calcium ions.

It provides the energy for muscle contraction.

It is the site where actin and myosin interact.

It is the site where acetylcholine is released.

A body is found that shows no signs of rigor mortis. The body has been dead for ....

less than 2 hours or more than 36 hours

less than 2 hours or more than 24 hours

less than 24 hours or more than 48 hours

Rigor Mortis can be defined as

the contraction of muscles and stiffening of the body after death

the changes in color skin undergoes after death

the change in body temperature after death

the pooling of blood in the body after death

Which of the following best describes the power stoke?

myosin heads pull on binding sites of the actin filament

actin's troponin pulls on the myosin filament

ATP detaches myosin from the myosin binding site

The motor neuron triggers the release of Ca2+ from the sarcolemma

When a muscle shortens under tension, it is called_______

isotonic concentric contraction

isometric concentric contraction

isometric eccentric contraction

Ch. 9 Muscle Contraction

Authored by Jennifer Malito

Other

12th Grade

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

The part of the sarcomere that A (green) refers to is the?

Z Line

M Line

H Line

A Line

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The part of the sarcomere that B (Orange) refers to is the?

Z Line

M Line

H Line

A Line

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The part of the sarcomere that C (Blue) refers to is the?

Actin

Myosin

Troponin

Tropomyosin

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The part of the sarcomere that D (Red) refers to is the?

Actin

Myosin

Troponin

Tropomyosin

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What zone/band of the sarcomere is represented by yellow.

I Band

A Band

H Zone

M Line

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What zone/band of the sarcomere is represented by pink.

I Zone/Band

A Zone/Band

H Zone/Band

M Zone/Band

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What zone/band of the sarcomere is represented by light brown.

I Zone/Band

A Zone/Band

H Zone/Band

M Zone/Band

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Ch. 9 Muscle Contraction

The part of the sarcomere that A (green) refers to is the?

The part of the sarcomere that B (Orange) refers to is the?

The part of the sarcomere that C (Blue) refers to is the?

The part of the sarcomere that D (Red) refers to is the?

What zone/band of the sarcomere is represented by yellow.

What zone/band of the sarcomere is represented by pink.

What zone/band of the sarcomere is represented by light brown.

What state is the sarcomere in #1

What state is the sarcomere in #2

What state is the sarcomere in #3

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