Chapter 9

Question 1

Properties of Tissue

Answer 1

1. Are responsive (means there are specific receptors/stimuli)
2. Muscles can only contract; in order to do opposite movement OG muscle must stop contracting

Question 2

Endomysium

function

Answer 2

• Separates individual muscle fibers
• indvidual straw
• myofiber

Question 3

Perimysium

Answer 3

Bundles fibers
Fascicle
Case of straws

Question 4

Epimysium

Answer 4

Encases fibers
Full muscle (i.e. deltoid)
Case of boxes of straws
muscle

Question 5

Myofibril

what type (box, straw, etc)? location? which filaments?

Answer 5

Toothpick inside of straw
myofibril in endomysium
sarcomere filaments

Question 6

Aponeurosis

Answer 6

-flat sheet of connective tissue
-similar to tendons
-cover muscles/help connect muscles to bones/cartilage
-i.e. epicranial, abdominal, plantar aponeurosis

Question 7

Origin vs. Insertion

Answer 7

Origin: non-moving, fixed portion
Insertion: moving

Question 8

Muscle Growth

hypertrophy, hyperplasia, myosatellite cells

Answer 8

Hypertrophy: increases muscle fiber size
Hyperplasia: increase muscle fiber number
Myosatellite cells: regenerate damaged muscle fibers (acts as stem cells)

Question 9

Somatic Motor Neuron
What is denervation atrophy?

Answer 9

Denervation atrophy leads to muscle shrinkage

1. message (presynaptic)
2. translator (chemicals/neurotransmitters)
3. translated/understands (postsynaptic)

Question 10

Synergist vs. Fixator

Answer 10

Synergist: helps prime movers
Fixator: keeps orgin in place (stabilize joints)

Both work together for movement of body