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Histology > Muscle Tissue > Flashcards

Muscle Tissue Flashcards

1
Q

What are the 3 types of muscle tissue?

A
  1. Skeletal
  2. Cardiac
  3. Smooth
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2
Q

This type of muscle has spindle shaped cells with one centrally located nucleus.

A

Smooth (visceral) muscle

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3
Q
  1. Smooth (visceral) muscles is in the walls of most ________, it moves substances through them
  2. Does it have striations?
A
  1. Organs
  2. No!
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4
Q

This type of muscle is located in the heart, it moves blood through it. Cells can have one or two centrally located nuclei

A

Cardiac

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5
Q

Cardiac muscle has short cylindrical cells. Some cells are ______, a unique feature.

A

Bifurcated

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6
Q

These are the visible gap junctions between cells in cardiac muscle

A

Intercalated discs

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7
Q

This type of muscle moves the skeleton, stabilizes joints, and produces heat when in contracts.

A

Skeletal Muscle

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8
Q
  1. Skeletal has long, cylindrical cells that are uni or multi nucleated?
  2. Where are the nuclei located?
A
  1. Multinucleated
  2. Periphery of the cell
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9
Q

Skeletal muscle is made up of many ________s, which each are one muscle cell

A

Muscle Fibers

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10
Q

Every skeletal muscle is classified as an ________, it has CT, blood vessels, nerves

A

Organ

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11
Q

These attach skeletal muscle to bone

A

Tendons

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12
Q

What are tendons composed of?

A

Dense Regular Connective Tissue

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13
Q

These are flat, sheet-like tendons

A

Aponeuroses

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14
Q
  1. Each muscle fiber is wrapped in….
  2. A group of muscle fibers is called…
  3. The fascicle is surrounded by…
  4. An entire muscle is surrounded by….
A
  1. Endomysium
  2. Fascicle
  3. Perimysium
  4. Epimysium
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15
Q

Surrounding all of the connect tissue wrappings in muscle is….

A

Deep Fascia

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16
Q

This binds skin to muscles

A

Superficial fascia

17
Q
  1. What is the muscle cell membrane called?
  2. What about the cytoplasm?
A
  1. Sarcolemma
  2. Sarcoplasm
18
Q

The muscle cell has organelles like lysosomes, ribosomes, and an endoplasmic reticulum which is called the….

A

Sarcoplasmic Reticulum

19
Q

What’s the role of the sarcoplasmic reticulum?

A

Stores Ca2+ ions needed for muscle contraction

20
Q

These are invaginations of the sarcolemma, and serve to rapidly conduct the nerve impulse through the muscle fiber

A

Transverse Tubules (T-Tubules)

21
Q

Each muscle fiber is composed of…

A

Myofibrils

22
Q

The myofibril is composed of protein filaments called…

A

Myofilaments

23
Q

This is the component of the thick myofilaments of the myofibril

A

Myosin

24
Q

This is the component of the thin filament of the myofibril

A

Actin

25
Q

The arrangement of myofilaments leads to what visible arrangment?

A

Striations

26
Q
  1. These are the lightly colored bands of myofibrils
  2. What are they composed of?
A
  1. I bands
  2. Think myofilaments only
27
Q
  1. These are the dark bands of the myofilament
  2. What are they composed of?
A
  1. A bands
  2. Thick AND thin filaments
28
Q
  1. This is the dark structure in the middle of an I band
  2. Importantly, what attaches to it?
A
  1. Z disc (Z line)
  2. Thin myofilament
29
Q
  1. This is a lighter, central region in the middle of an A band
  2. What is it composed of?
A
  1. H Zone (H Band)
  2. Thick myofilaments only
30
Q
  1. This is the dark line in the middle of the H zone
  2. What attaches to it?
A
  1. M disc
  2. Thick myofilaments
31
Q
  1. These are the functional contractil unit of myofibrils..
  2. They run from ____ to ____, creating the banded pattern
A
  1. Sarcomere
  2. Z-disc to Z-disc
32
Q

In the sliding filament model of contraction, the muscle is stimulated by a nerve, what does this cause?

A

Sarcomere shortening

33
Q

The thick and thin filaments slide over one another, shortening the length of the sarcomere, causing the muscle to contract

A

: D

34
Q
  1. During muscle contraction, what happens to the H zone?
  2. I zone?
  3. Z discs?
  4. A band?
A
  1. It disappears
  2. It narrows
  3. Move closer together
  4. Width stays the same

Histology (4 decks)

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