Muscle tissue

Question 1

What is voluntary muscle?

Answer 1

skeletal

Question 2

What is involuntary muscle?

Answer 2

Smooth and cardiac

Question 3

What structure is voluntary muscle?

Answer 3

Striated

Question 4

What structure is involuntary muscle?

Answer 4

Started or non-striated.

Question 5

The subconscious movements to maintain posture and balance is made by what muscle?

Answer 5

skeletal

Question 6

Describe the structure of skeletal muscle.

Answer 6

Unbranched.

Nuclei on periphery.

Myofibrils create striated appearance.

Question 7

Describe the layers of connective tissue around skeletal muscle.

Answer 7

Endomysium: Surrounds a single fibre.

Perimysium: Surrounds the group of fibres.

Epimysium: Surrounds the entire muscle.

Question 8

What are myofibrils separated by?

Answer 8

Sarcoplasm.

Question 9

What kind of muscle is the sarcoplasmic reticulum present in?

Answer 9

Striated (cardiac and skeletal)

Question 10

Under the microscope; how does myosin appear?

Answer 10

Thicker and darker

Question 11

Under the microscope; how does actin appear?

Answer 11

Thinner and lighter

Question 12

What divides each myofilament into contractile units called sarcomeres?

Answer 12

Z lines.

Question 13

What is the chemical messenger at neuromuscular junctions?

Answer 13

Acetylcholine

Question 14

What is the structure of cardiac muscle?

Answer 14

Branched
Cylindrical

1/2 Central nuclei

Striated

Question 15

What are the similarities between skeletal and cardiac muscle?

Answer 15

Both have sliding filament mechanism and sarcoplasmic reticulum.

Question 16

What are the differences between cardiac and skeletal muscle?

Answer 16

Cardiac slowly leaks Ca. (Allows ventricular filling)

Have intercalated disks. (allows wave-like contraction)

Question 17

Explain the conducting system of the heart.

Answer 17

Pulse initiated at the sinoatrial node.
Both atria contract.

The pulse then travels to the atrioventricular node.

Travels to the bundle of His.

Travels to the purkinje fibres and cardiac muscle.
Ventricles contract.

Question 18

What does the modified cardiac muscle of the conducting system not have?

Answer 18

Intercalated discs.

T tubules.

Question 19

what is the structure of smooth muscle?

Answer 19

Spindle shaped with tapered ends.
No striations.
Single central nuclei.

Question 20

Is there actin and myosin in smooth muscle?

Answer 20

Yes

Question 21

What is smooth muscle modulated by?

Answer 21

The autonomic nervous system and hormones.

Question 22

What are the peristalsis pacemakers called?

Answer 22

Interstitial cells of cajal.