Question 9 (1 point) Select ANY STATEMENTS that could be used to describe smooth

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Question 9 (1 point)

Select ANY STATEMENTS that could be used to describe smooth muscle physiology

Question 9 options:

Actin and myosin interact by the sliding filament theory

Tropomyosin is the site of calcium regulation in the contraction

Calmodulin is the site of calcium regulation in the contraction

ATP energizes the sliding process

The trigger for contraction is a rise in intracellular calcium

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Question 10 (1 point)

Rigor mortis is defined as "stiffening of muscles upon death."

A similar condition can occur when one is alive, called "lockjaw." Patients with lockjaw open their mouth or swallow. Tetanus leads to dead in 1/10 the cases.

In lockjaw, the body is able to make ATP, however, muscle contractions continue to occur and can not stop. Having ONLY THE INFORMATION IN THIS QUESTION and YOUR KNOWLEDGE OF MUSCLE CONTRACTIONS, which, if any, of the following statements COULD be the cause of lockjaw.

SELECT ANY ACCURATE STATEMENTS.

Question 10 options:

ATP is not freely available in the cytoplasm of a muscle cell therefore the muscle remains contracted

The nervous sytem fails to release acetylcholine to silence muscle contractions and the contractions continue.

Calcium levels remain elevated in the muscle cells allowing contractions to continue

Sodium leaks out of a cell causing causing continuous depolarization of the muscle cells

Acteylcholine levels remain high around muscle cells, causing the continuous depolarization and contraction of muscle cells.

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Question 11 (1 point)

You purchase a pack of gum and chew three pieces. You plan to blow bubbles. Which muscle would be important in compressing the cheeks (e.g. gums touching your teeth)

SELECT ONE ACCURATE ANSWER.

Question 11 options:

orbicularis oris

pterygoids

masseters

corrugator supercilli

buccinators

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Question 12 (1 point)

A karate chop involves several muscles of the wrist. One muscle would be the extensor carpi radialis brevis.

Which other muscles would produce a similar action?

SELECT ANY ACCURATE ANSWERS.

Question 12 options:

flexor digitorum (profundus or superficialis)

biceps brachii

flexor carpi radialis

extensor carpi radialis longus

triceps brachii

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Question 13 (1 point)

A(n) _________ would be defined as a fulcrum between an effort and load.

SELECT ANY ACCURATE ANSWER.

Question 13 options:

first class lever

a fourth class lever

third class lever

a fifth class lever

second class lever

Actin and myosin interact by the sliding filament theory

Tropomyosin is the site of calcium regulation in the contraction

Calmodulin is the site of calcium regulation in the contraction

ATP energizes the sliding process

The trigger for contraction is a rise in intracellular calcium

Explanation / Answer

( 9) Clamodium is the site of calcium regulation in contraction.

(10) Nervous system fails to release acetylcholine to silence muscle contraction and the contraction continues is one of the cause of Lockjaw.

(11) Buccinator muscle is the main muscle of the cheek when you blow,whistle,smile or suck this muscle is used.

(12) The extensor carpi radialis brevis muscle aids in moving the hand.This muscle work inconcert with the extensor carpi radialis longus,which is situated nearby.

(13) Class 1 lever has fulcrum placed between effort and load.The movement of the load is in the opposite direction of the movement of effort.

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