Lecture 7 Flashcards

1
Q

Name the 3 types of muscle tissue and their function

A
  • Skeletal muscle – Structure – Innervation – Types
  • Cardiac muscle – Structure – Innervation
  • Smooth muscle – Structure – Innervation
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2
Q

What type of muscle is represented in the picture

A

Skeletal Muscle

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3
Q

What type of muscle is represented in the picture

A

Cardiac Muscle

Involuntary

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4
Q

What type of muscle is represented in the picture

A

Smooth muscle

Involuntary

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5
Q

Name the layers of Skeletal Muscle

A

Epimysium – dense CT

  • Perimysium – derived from the epimysium, surrounds a fascicle, a functional muscle unit
  • Endomysium – reticular fibers and extracellular matrix
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6
Q

What is this a cross-section of

A

Skeletal muscle

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7
Q

what type of muscle is presented in this Longitudinal section

A

Skeletal muscle

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8
Q

Who do you love

A

Nash

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9
Q

What is represented by the C and N in the skeletal muscle image below

A

C – capillary

N - nucleus

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10
Q

Label the picture below

A
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11
Q

Label the picture below

A
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12
Q

What type of innervation does skeletal muscle have as well as what neurotransmitter is it associated with

A

Voluntary innervation by the peripheral nervous system

  • Neuromuscular junction (synapse) between unmyelinated axonal terminal (motor end plate) and individual muscle fiber
  • Neurotransmitter – acetylcholine
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13
Q

What is a motor unit

A

a group of muscles innervated by a single spinal nerve

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14
Q

What is depicted in the image

A

Muscle spindle

Lec 6, Slide 16

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15
Q

Label the picture

A
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16
Q

What is depicted in the image

17
Q

What type of muscle is depicted

A

Cardiac muscle

Single, central nucleus • Intercalateddiscs
• Branchedcells
• Involuntaryinnervation

18
Q

What type of muscle is this a cross section of

A

cardiac muscle

19
Q

what type of muscle is depicted in this longitudinal section

A

Cardiac muscle

20
Q

Identify the labeled image

A

Cardiac Muscle

G – gap junction
F – fascia adherens

D - desmosome

21
Q

What is depicted in the image

A

Intercalated discs

  • Bind cardiac myocytes
  • Anchor myofibrils: α-actinin in fascia adherens, Desmosomes (desmin -intermediate filament)
  • Gap junctions in longitudinal portions form functional syncytium
22
Q

Identify the area circled

A

transverse tubule system (diads)

23
Q

What is indicated by the arrows

A

Purkinje fibers

24
Q

Purkinje Fiber

A

Involuntary innervation by autonomic nervous system

Pacemaker system of modified cardiac muscle cells that generate and coordinate myocardial contractions during cardiac cycle (Purkinje system)

25
What type of muscle is this and what do the letters represent
Smooth Muscle C: longitudinal section G: ganglion (neurons) L: cross section
26
What type of muscle tissue is this
Smooth muscle
27
Smooth muscle
* Sheets or bundles in the walls of many organs (e.g. GI & respiratory tracts, blood vessels) * Lack of striation * Spindle-shaped cells * Single nucleus * Communication via gap junctions * Involuntary innervation * Smooth muscle cells synthesize collagen, elastin, and proteoglycans
28
29
Name the type of muscle
Smooth muscle
30
What type of muscle is in this picture
Smooth muscle
31
What type of muscle is this a longitudinal section of
Smooth Muscle
32
What muscle type is depicted in the cross section shown
Smooth Muscle
33
What type of muscle tissue is depicted below
Smooth Muscle
34
Smooth muscle contraction
• Involuntary innervation by autonomic nervous system  Small muscle group – high degree of autonomic innervation (e.g. iris of the eye)  Large muscle group – generate their own low level of contractions, autonomic innervation modifies contractions (e.g. peristalsis in the gastrointestinal tract)