Which one of the following is a key characteristic of slow twitch muscle fibers?

They contain large amounts of Mitochondria

They contain low numbers of Mitochondria

Which one of the following is a key characteristic of Fast Twitch B muscle fibers?

They contract rapidly with great force but fatigue fast (as they use creatine phosphate pathway)

They are Red in color, meaning they contain a lot of mitochondria

They are recruited for long duration activities

They contain high numbers of Mitochondria

Identify one factor that can cause the first sodium channel to open in a muscle cell.

Acetylcholine being released from the motor neuron

Calcium ions being released from the sarcoplasmic reticulum.

Calcium ions binding to troponin

ATP causing the myosin heads to pop up.

Which statement about a tetanus is false?

It is caused by allowing the muscle to relax too many times between contractions.

It is a maximum sustained contraction

It is caused by stimulating contraction before a muscle has time to relax

It remains contracted until the muscle fatigues

A motor unit is made up of _______________.

a motor neuron and the muscle fibers it innervates

all the muscle fibers within a given muscle

all the neurons going into an individual section of the body

Creatine phosphate provides energy to muscle cells by

becoming oxidized and losing phosphate to ADP to form ATP

becoming oxidized and losing phosphate to ATP to form ADP

providing ATP directly to muscle cells

providing ADP directly to muscle cells

Muscle Physiology

Authored by Ann Froehle

Biology

10th Grade - University

NGSS covered

Used 552+ times

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27 questions

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

When a muscle is relaxed and in a lengthened position, what is the relationship between actin filaments?

They are on top of one another

They are beside each other

They are close to each other

They are far apart from each other

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Z represents

Dendrite

Axon Terminal

Neurotransmitters

Synapse

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Once calcium is released, it will

attaches to myosin head

attaches to receptors

attaches to tropomyosin

attaches to troponin

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Number 3 represents which of the following events

action potential reaches the axon terminal

sodium rushes into the muscle fiber

potassium leaving the muscle fiber

ACh crossing the synaptic cleft

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What are the two ions transported across the membrane in an action potential?

O^2- and K⁺

K⁺and Na⁺

Ca⁺²and B⁺³

Na⁺¹ and Cl

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which of the following is NOT a muscle function?

Movement of skeleton

Heat generation

Transport substances around body

Moves neurons around body

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the name of the protein myofilament that pulls the actin towards the center of the Sarcomere?

Fascicle

Actin

Myosin

Titin

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Muscle Physiology

When a muscle is relaxed and in a lengthened position, what is the relationship between actin filaments?

Z represents

Once calcium is released, it will

Number 3 represents which of the following events

What are the two ions transported across the membrane in an action potential?

Which of the following is NOT a muscle function?

What is the name of the protein myofilament that pulls the actin towards the center of the Sarcomere?

Which of the following is the name given to the connective tissue that covers of a muscle fascicle or bundle of muscle?

Which one of the following is a key characteristic of slow twitch muscle fibers?

Which one of the following is a key characteristic of Fast Twitch B muscle fibers?

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