Smooth Muscle Physiology Flashcards

1
Q

T/F smooth muscle has striation

A

False, it has no striation

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2
Q

Describe the arrangements of the muscle proteins in smooth muscle

A

Actin and myosin are not arranged to form a myofibril

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3
Q

T/F: Smooth muscle has T-Tubules

A

False

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4
Q

Is smooth muscle voluntary or involuntary?

A

Involuntary

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5
Q

What are the cell communications used by Smooth muscle?

A

Gap junctions

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6
Q

Describe Smooth muscle

A
  • long spindle shaped
  • one central nucleus
  • no striation
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7
Q

The myofilaments are arranged how?

A

criss cross in sarcoplasm in latticework appearance

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8
Q

What are the anchoring sites for actin filaments in smooth muscle?

A

Dense bodies

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9
Q

What do Dense bodies resemble from skeletal muscle?

A

z lines

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10
Q

What are the two types of functional smooth muscle?

A
  • single unit
  • multi unit
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11
Q

Why are functional sm mm referred to as single or multi?

A

It refers to te number of nerve fibers require to activate the smooth muscle tissue

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12
Q

Which functional smooth muscle has no gap junction?

A

Multi unit

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13
Q

How many nerve fibers innervate the single unit smooth muscle?

A

one

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14
Q

What is another name for unitary smooth muscle?

A

visceral or syncytial

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15
Q

What connects unitary cell membranes at multiple points to transmit the force?

A

Adherent junctions

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16
Q

Syncytium is:

A

The contraction of a mass of fibers

17
Q

What can unitary smooth muscle display in response to stretch?

A

Intrinsic or myogenic contraction

18
Q

Where can you find multi unit smooth muscle?

A

-iris
- airways
- ciliary muscles

19
Q

Are multi unit smooth muscles capable of intrinsic activity?

A

no, only extrinsic

20
Q

Muscle fibers of a multi unit will form what?

A

Motor unit

21
Q

What is the protein that replaces troponin in smooth muscle and activates myosin light-chain kinase?

A

Calmodulin

22
Q

In smooth muscle, does Ca enter from internal or external stores?

A

External through voltage gated Ca channels

23
Q

Action potential of smooth muscle is mediated by voltage gated _____ Channels

24
Q

Smooth muscles are innervated by which motor neurons?

25
Q

T/F there are motor end plates in NMJS in smooth muscle

A

False, there are autonomic NT receptors