Skeletal Muscle Structure

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

Creatine phosphate

Glycogen

Calcium

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

Explanation

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

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

Myofibrils

Blood vessels

Endomysium

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

Explanation

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

3. 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.

True

False

4. 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 ...

Deflect calcium molecules away from the actin

Interact with specialised active sites on the thin filaments

Over power the actin sites as the myosin is a more formidable protein.

5. Which of the following muscle structures surrounds the muscle belly.

Fasiculi

Epimysium

Perimysium

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

Explanation

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

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

Fasiculi

Endomysium

Myofibrils

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

Action potential

Acetylcholine

The synaptic transmitter

8. Name the receptor sites on the motor neurone

Axon

Dendrites

Sarcolemma

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

Synaptic cleft

Synapse

Synaptic vesicles

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

True

False

It is also composed of tropomyosin

Explanation

It is also composed of tropomyosin

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

Allow nerve impulses to received by the plasmalemma to be transmitted rapidly to myofibrils

They allow the rebuilding of the muscle fiber during the recovery stage (post exercise)

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Skeletal Muscle Structure

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

2.

What first name or nickname would you like us to use?

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

3. 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.

4. 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 ...

5. Which of the following muscle structures surrounds the muscle belly.

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

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

8. Name the receptor sites on the motor neurone

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

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

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