1.2.1: Causes of Contraction

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25 questions

1

9

1

Which type of muscle tissue is this?

1

What type of muscle tissue is this?

1

What type of muscle tissue is this?

You kick a soccer ball which type of muscle is involved?

smooth

cardiac

skeletal

all of the above

Which of the following would be involved in peristalsis?

_________________ has branching fibers, one nucleus per cell, striations, and intercalated disks. Its contraction is not under voluntary control.

Which substances are needed for muscle contraction?

1

If the original length of a muscle strand is 42mm long and the final length is 37mm long, what is the percent contraction?

1

What is your answer from question #8? (Round to nearest whole percent)

When the muscle fibers shorten, the striations are getting closer together.

True

False

1

What is this structure?

1

What is this structure?

1

What is this structure?

1

This energy molecule is required for muscle contraction

1

What is this structure?

1

_______ diffusing in the cytoplasm between myosin and actin filaments of the muscle fibrils causes the filaments to slide into each other, triggering the contraction of the entire muscle fiber

1

The green area here represents the

1

This structure is called (blue area)

1

This structure is called (red area)

1

These molecules that assist with sarcomere contraction are

The explanation of how thick and thin filaments slide relative to one another during striated muscle contraction to decrease sarcomere length is referred to as the (3 words)

Order the steps below in the correct sequence of muscle contraction.

Energized myosin heads, with an attached ADP molecule and phosphate group, bind to the open myosin binding sites on actin. This forms the actin-myosin cross-bridge.
Acetylcholine then diffuses across the synaptic cleft and attaches to acetylcholine receptors on the sarcolemma at the neuromuscular junction.
Calcium binds to troponin on the actin filaments of muscle fibers. This signals tropomyosin to move out of the myosin binding sites on actin.
After the cross-bridge forms, the myosin head rotates towards the center of the sarcomere. As it rotates, the myosin releases its ADP and phosphate.
This action slides the thin actin past the thick filament, creating the power stroke.
An action potential is generated and travels along the sarcolemma
As a nerve impulse reaches the ends of an axon terminal, it stimulates the release of acetylcholine from synaptic vesicles.
Calcium is released from the sarcoplasmic reticulum.
After the power stroke, the actin-myosin cross-bridge remains intact until an ATP molecule binds to the myosin head. After ATP attaches to myosin, the myosin detaches from actin.

Muscle cramps can be due to low levels of _____ . If these are deficient, the muscle cannot relax.

actin 

salts

ATP

myosin

ATP is required for muscle contractions to relax.

True

False

If you exercise on an empty stomach and drink only water, you should have enough stored glucose to produce ATP.

True

False

What type of muscle tissue is this?

You kick a soccer ball which type of muscle is involved?

smooth

cardiac

skeletal

all of the above

Which of the following would be involved in peristalsis?

all of the above

skeletal

smooth

cardiac

none of the above

_________________ has branching fibers, one nucleus per cell, striations, and
intercalated disks. Its contraction is not under voluntary control.

skeletal

none

smooth

all

cardiac

Which substances are needed for muscle contraction?

water

glucose

insulin

salt

Adenosine Diphosphate

glucagon

Adenosine Triphosphate (ATP)

What is your answer from question #8? (Round to nearest whole percent)

When the muscle fibers shorten, the striations are getting closer together.

True

False

What is this structure?

This energy molecule is required for muscle contraction

What is this structure?

_______ diffusing in the cytoplasm between myosin and actin filaments of the muscle fibrils causes the filaments to slide into each other, triggering the contraction of the entire muscle fiber

This structure is called (blue area)

This structure is called (red area)

These molecules that assist with sarcomere contraction are

Order the steps below in the correct sequence of muscle contraction.

Energized myosin heads, with an attached ADP molecule and phosphate group, bind to the open myosin binding sites on actin. This forms the actin-myosin cross-bridge.

Acetylcholine then diffuses across the synaptic cleft and attaches to acetylcholine receptors on the sarcolemma at the neuromuscular junction.

Calcium binds to troponin on the actin filaments of muscle fibers. This signals tropomyosin to move out of the myosin binding sites on actin.

After the cross-bridge forms, the myosin head rotates towards the center of the sarcomere. As it rotates, the myosin releases its ADP and phosphate.

This action slides the thin actin past the thick filament, creating the power stroke.

An action potential is generated and travels along the sarcolemma

As a nerve impulse reaches the ends of an axon terminal, it stimulates the release of acetylcholine from synaptic vesicles.

Calcium is released from the sarcoplasmic reticulum.

After the power stroke, the actin-myosin cross-bridge remains intact until an ATP molecule binds to the myosin head. After ATP attaches to myosin, the myosin detaches from actin.

Muscle cramps can be due to low levels of _____ . If these are deficient, the muscle cannot relax.

actin 

salts

ATP

myosin

ATP is required for muscle contractions to relax.

True

False

If you exercise on an empty stomach and drink only water, you should have enough stored glucose to produce ATP.

True

False