Part 2

Question 1

Why is collagen vital to muscle infrastructure?

Answer 1

bind myocytes, transduces force, conveys blood vessels and nerves

Question 2

synctium

Answer 2

multinuclei

Question 3

_____ multiply and join to make ________, which mature and then can no longer proliferate, but enlarge by _______

Answer 3

myoblasts (satellite cells, stem cells), muscle fibers (muscle cells), jypertropy (NOT hyperplasia)

Question 4

motor unit=

Answer 4

motor neuron + all muscle fibers it innervates

Question 5

during contraction, sarcomere arrangment….

Answer 5

i and h decrease, z closer together

Question 6

titin

Answer 6

structural prot of myofibril, hold prot in place. most plentiful. z disc to m line

Question 7

a-actinin

Answer 7

structural prot of myofibril, anchor actin to z line

Question 8

nebulin

Answer 8

structural prot of myofibril, anchor actor to z disc

Question 9

myomesin

Answer 9

structural prot of myofibril, form m line and hold thick filaments in place

Question 10

c protein

Answer 10

structural prot of myofibril, hold myosin at m line

Question 11

dystrophin

Answer 11

structural prot of myofibril, actin to sarcolemma

Question 12

desmin

Answer 12

structural prot of myofibril, link a-actinin to sarcolemma

Question 13

structural prots of myofibril

Answer 13

titin, a-actinin, nebulin, myomesin, c prot, dystrophin, desmin

Question 14

where can you find t-tubules

Answer 14

around myofibrils, at A-I junction in skel, Z in cardiac

Question 15

cardiac muscle has more ___ than skeletal muscle (40% by vol vs 2%)

Answer 15

mitochondria

Question 16

two types of smooth muscle

Answer 16

visceral (single), multiunit

Question 17

in smooth muscle, there is _______ instead of t-tubules

Answer 17

caveolae

Question 18

in nervous system, high __ concentration inside the cell, high __ concentration outside the cell

Answer 18

K, Na