Skeletal Muscle Structure

11 Questions | By Ags2511 | Updated: Mar 20, 2022 | Attempts: 2927

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1.

Which of the following muscle structures surrounds the muscle belly.
- A.
  
  Fasiculi
- B.
  
  Epimysium
- C.
  
  Perimysium
Correct Answer
B. Epimysium

Explanation
the epimysium is the outer connective tissue covering the muscle belly.
the perimisium surrounds the (fasiculi)

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2.

What is the name of the bundles of fibres found within the muscle belly itself?
- A.
  
  Fasiculi
- B.
  
  Endomysium
- C.
  
  Myofibrils
Correct Answer
A. Fasiculi
3.

Which muscle fiber structure forms part of the fasiculi and are the contractile elements of the muscle?
- A.
  
  Myofibrils
- B.
  
  Blood vessels
- C.
  
  Endomysium
Correct Answer
A. Myofibrils

Explanation
each muscle fiber structure conatins hundreds to several thousands of myofibrils. They appear as long strands of smaller sub-units known as sarcomeres.

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4.

The sarcoplasm is the fluid part of the muscle fiber (cytoplasm) which fills the spaces between the myofibrils. The difference between the cytoplasm of the muscle fiber and most cells is that it contains large stores of glycogen as well as the oxygen binding compound myoglobin.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True
5.

The transverse tubules are extensions of the plasmalemma which pass laterally through the muscle fiber. Identify the correct functions of the transverse tubules.
- A.
  
  Allow nerve impulses to received by the plasmalemma to be transmitted rapidly to myofibrils
- B.
  
  They provide pathways from outside the fiber to the interior to allow substances to enter the cell and waste products to leave the fibers.
- C.
  
  They allow the rebuilding of the muscle fiber during the recovery stage (post exercise)
Correct Answer(s)
A. Allow nerve impulses to received by the plasmalemma to be transmitted rapidly to myofibrils
B. They provide pathways from outside the fiber to the interior to allow substances to enter the cell and waste products to leave the fibers.
6.

The sarcoplamic reticulum is required to store which of the following compounds to enable muscular contraction?
- A.
  
  Creatine phosphate
- B.
  
  Glycogen
- C.
  
  Calcium
Correct Answer
C. Calcium

Explanation
Calcium teams up with troponin to remove tropomyosin from the actin and allow the myosin cross bridges to attach.

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2
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7.

The thin filament as well as being referred to as actin is also composed of tropinin.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
It is also composed of tropomyosin

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8.

The myosin filaments is composed of two protein strands twsited together (as seen in the image below). The thick heads on the strands known as the myosin heads are designed to ...
- A.
  
  Deflect calcium molecules away from the actin
- B.
  
  Interact with specialised active sites on the thin filaments
- C.
  
  Over power the actin sites as the myosin is a more formidable protein.
Correct Answer
B. Interact with specialised active sites on the thin filaments
9.

Name the receptor sites on the motor neurone
- A.
  
  Axon
- B.
  
  Dendrites
- C.
  
  Sarcolemma
Correct Answer
B. Dendrites
10.

What is the communication between the motor end plate and the axon terminals known as?
- A.
  
  Synaptic cleft
- B.
  
  Synapse
- C.
  
  Synaptic vesicles
Correct Answer
B. Synapse
11.

What is the transmitting substance (which is responsible for carrying the impulse across the synaptic cleft) called?
- A.
  
  Action potential
- B.
  
  Acetylcholine
- C.
  
  The synaptic transmitter
Correct Answer
B. Acetylcholine

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Current Version
Mar 20, 2022

Quiz Edited by
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Feb 22, 2012

Quiz Created by
Ags2511

Skeletal Muscle Structure

Which of the following muscle structures surrounds the muscle belly.

What is the name of the bundles of fibres found within the muscle belly itself?

Which muscle fiber structure forms part of the fasiculi and are the contractile elements of the muscle?

The sarcoplasm is the fluid part of the muscle fiber (cytoplasm) which fills the spaces between the myofibrils. The difference between the cytoplasm of the muscle fiber and most cells is that it contains large stores of glycogen as well as the oxygen binding compound myoglobin.

The transverse tubules are extensions of the plasmalemma which pass laterally through the muscle fiber. Identify the correct functions of the transverse tubules.

The sarcoplamic reticulum is required to store which of the following compounds to enable muscular contraction?

The thin filament as well as being referred to as actin is also composed of tropinin.

The myosin filaments is composed of two protein strands twsited together (as seen in the image below). The thick heads on the strands known as the myosin heads are designed to ...

Name the receptor sites on the motor neurone

What is the communication between the motor end plate and the axon terminals known as?

What is the transmitting substance (which is responsible for carrying the impulse across the synaptic cleft) called?