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(Answered) Human Anatomy and Physiology 1 Homework 19

Bio 201

Question 1

Match each description with the term that is described.

The neurotransmitter at the neuromuscular junction.

The enzyme that remains within the synaptic cleft

A chemically-gated channel  AChR

This ensures that one stimulus in the motor neuron produces only a short contraction.

Found only on the endplate membrane.

All Answer Choices
A. ACh

Question 2

Match the SR transporter with the descriptions.

calcium leaves the SR through these

this is a type of active transport

this is for facilitated diffusion

calcium enters the SR through these

the action of these helps to stop a contraction

the action of these helps to lead to a contraction

This is completely passive

these are voltage-gated

All Answer Choices
A. calcium channels
B. calcium pumps

Question 3

The calcium channel in the SR is considered to be gated.  That calcium channel is specifically voltage-gated.  That means that it opens when the action potential runs along the [3].  The gating of the channel [4] ATP to occur.

Meanwhile, on the postsynaptic membrane of the neuromuscular junction there are also gated channels.  These are also called [5] receptors.  These channels are considered to be [6]-gated.  In order to open, it [7] ATP.  When these gated channels are open they allow [8] to pass through them.

All Answer Choices

does not require
sodium and potassium
SR membrane

Question 4

Please keep in mind that an answer can be used more than once.

In a sarcomere there are both actin and myosin filaments.  The myosin filament has tropomyosin associated with it.  When a muscle fiber is resting, the tropomyosin blocks the [2] on each actin protein.  After calcium is available, tropomyosin is tugged out of the way by [3].  This enables each myosin [4] group to attach to the thin filament with its [5].  When the powerstroke occurs, the myosin protein bends at the [6] on its neck.  The powerstroke pulls on the entire [7] so that the Z-lines are pulled inward.  In order to do this again, another adenosine triphosphate molecule has to bind to the [8] on the [9] region of the myosin molecule so that the cross-bridge can disconnect.  To become re-energized, the head group has to break down the ATP molecule using its [10] function.  Throughout this entire time, the [11] region of the myosin molecules are not doing anything but remaining stuck within the [12] to hold all the myosin molecules together.

All Answer Choices

actin filament
myosin filament
actin-binding site
myosin-binding site
ATP-binding site
Response Feedback:
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Question 5

Put the items below about the neuromuscular junction into the right order.

an action potential reaches the motor axon terminal.
calcium ions enter the axon terminal
acetylcholine diffuses across the synaptic cleft

synaptic vesicles fuse with the axon terminal membrane

the sarcolemma generates an action potential adjacent to the endplate

an action potential runs along the entire sarcolemma including the t-tubules
the muscle fiber becomes more positively charged near the endplate

voltage-gated calcium channels open

acetylcholine binds to acetylcholine receptors
Sodium ions enter the muscle fiber across the endplate membrane

Question 6

Examine the steps below and put them in the correct order.

An action potential is generated in the muscle fiber

ACh levels rise in the neuromuscular junction

Na+ enters into the muscle fiber through ACh receptor channels.

Calcium ions are pumped by active transport into sarcoplasmic reticulum

Action potential travels along sarcolemma and t-tubules causing the DHP receptor to change shape

DHP receptor changing shape causes calcium ion to be released from the sarcoplasmic reticulum into the cytosol.

Calcium ions bind to troponin allowing formation of cross bridges

Calcium unbinds from the troponin

Power stroke carried out by myosin heads

Myosin heads release and elastic filaments pull filaments back to relaxed position.

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