Cardiac Histology Flashcards

1
Q

Define cardiac muscle and smooth muscle in general terms

A

Cardiac - striated and involuntary

Smooth - non-striated and involuntary

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2
Q

What are smooth muscles connected with and what are their physiological purposes

A

Gap junctions which help spread the AP

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3
Q

How many nuclei do SM have

A

1

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4
Q

Smooth muscle are capable of doing what

A

Producing continuous contractions of low force

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5
Q

What do the thick and thin elements anchor to in SM

A

Cytoplasmic densities and dense bodies

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6
Q

SM contract in what way

A

As one unit and assume a globular shape

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7
Q

What are the dense bodies that anchor the filaments in SM made of

A

Desmin and vimentin

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8
Q

Define caveolae

A

The T-tubles of SM

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9
Q

Cardiac muscles are what 4 things

A

Short
Branched
Y-shaped
Contain extensive capillaries

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10
Q

The epicardium is lined with what and what is this made of

A

Mesothelium which is made up of simple squamous epithelium

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11
Q

What is the fibroud epicardium made of

A

Dense fibrocollagenous CT with elastic fibers

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12
Q

Where do intercalated disks sit and what is their purpose in myocardium

A

Always at Z-lines

Bind cells, transmit forces of contraction, and allow for the spread of AP

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13
Q

What are the two regions of the intercalated discs

A

Transverse region

Longitudinal region

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14
Q

What are the two parts of the transverse region and define them

A
  1. Fascia adherens - actin filaments at the ends of terminal sarcomeres which transmit contractile forces b/w cells. These are the most prominent
  2. Desmosomes - provide anchorage of the intermediate filaments of the cytoskeleton
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15
Q

What make sup the Longitudinal region and what is its function

A

Gap Junctions - sites for AP transfer

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16
Q

What comprises a Dyad

A

1 T-tubul;e and 1 SR cisterna

17
Q

What is the purpose of Atrial Granules

A

Release precursor of ANF which allows for H@0 retention in kidneys

18
Q

What it eh endocardium made up of

A

Endothelium (simple squamous) and loose CT

19
Q

What os the cardiac skeleton made up of

A

Dense irregular CT in the endocardium