Lecture 7

Question 1

Name the 3 types of muscle tissue and their function

Answer 1

• Skeletal muscle – Structure – Innervation – Types
• Cardiac muscle – Structure – Innervation
• Smooth muscle – Structure – Innervation

Question 2

What type of muscle is represented in the picture

Answer 2

Skeletal Muscle

Question 3

What type of muscle is represented in the picture

Answer 3

Cardiac Muscle

Involuntary

Question 4

What type of muscle is represented in the picture

Answer 4

Smooth muscle

Involuntary

Question 5

Name the layers of Skeletal Muscle

Answer 5

Epimysium – dense CT

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

Question 6

What is this a cross-section of

Answer 6

Skeletal muscle

Question 7

what type of muscle is presented in this Longitudinal section

Answer 7

Skeletal muscle

Question 8

Who do you love

Answer 8

Nash

Question 9

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

Answer 9

C – capillary

N - nucleus

Question 10

Label the picture below

Answer 10

Question 11

Label the picture below

Answer 11

Question 12

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

Answer 12

Voluntary innervation by the peripheral nervous system

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

Question 13

What is a motor unit

Answer 13

a group of muscles innervated by a single spinal nerve

Question 14

What is depicted in the image

Answer 14

Muscle spindle

Lec 6, Slide 16

Question 15

Label the picture

Answer 15

Question 16

What is depicted in the image

Answer 16

Question 17

What type of muscle is depicted

Answer 17

Cardiac muscle

Single, central nucleus • Intercalateddiscs
• Branchedcells
• Involuntaryinnervation

Question 18

What type of muscle is this a cross section of

Answer 18

cardiac muscle

Question 19

what type of muscle is depicted in this longitudinal section

Answer 19

Cardiac muscle

Question 20

Identify the labeled image

Answer 20

Cardiac Muscle

G – gap junction
F – fascia adherens

D - desmosome

Question 21

What is depicted in the image

Answer 21

Intercalated discs

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

Question 22

Identify the area circled

Answer 22

transverse tubule system (diads)

Question 23

What is indicated by the arrows

Answer 23

Purkinje fibers

Question 24

Purkinje Fiber

Answer 24

Involuntary innervation by autonomic nervous system

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

Question 25

What type of muscle is this and what do the letters represent

Answer 25

Smooth Muscle

C: longitudinal section

G: ganglion (neurons)

L: cross section

Question 26

What type of muscle tissue is this

Answer 26

Smooth muscle

Question 27

Smooth muscle

Answer 27

• 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

Question 29

Name the type of muscle

Answer 29

Smooth muscle

Question 30

What type of muscle is in this picture

Answer 30

Smooth muscle

Question 31

What type of muscle is this a longitudinal section of

Answer 31

Smooth Muscle

Question 32

What muscle type is depicted in the cross section shown

Answer 32

Smooth Muscle

Question 33

What type of muscle tissue is depicted below

Answer 33

Smooth Muscle

Question 34

Smooth muscle contraction

Answer 34

• 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)