MCBM Exam 3 Muscle Hovorka

Question 1

What are the 2 characteristics of muscle?

Answer 1

contractile and conductive

Question 2

What is contractile?

Answer 2

causes movement of the body and changes in the size/shape of internal organs

Question 3

What is conductive?

Answer 3

skeletal muscle is a major source of body heat (by product of cellular respiration)

Question 4

What are the 3 types of muscle?

Answer 4

smooth
cardiac
striated

Question 5

What are some characteristics of skeletal muscle and where is it found?

Answer 5

muscles of skeleton and some viscera (tongue, esophagus) somatic ands striated

Question 6

What are characteristics of cardiac muscles?

Answer 6

heart, autonomic, striated

Question 7

What are characteristics of smooth muscle?

Answer 7

walls of viscera, blood vessels, and skin, autonomic, and not striated

Question 8

Is skeletal multinucleated?

Answer 8

yes

Question 9

Is cardiac multinucleated?

Answer 9

no has a single nucleus

Question 10

Where is the nucleus located in the cardiac muscle?

Answer 10

centrally

Question 11

Where is the nucleus located in the skeletal muscle?

Answer 11

located peripherally

Question 12

What is the skeletal muscle organization?

Answer 12

muscle
muscle fascicle
muscle fibre
myofibrils
myofilaments

Question 13

What is the muscle cell called?

Answer 13

a muscle fibre

Question 14

What connective tissue is associated with skeletal muscle?

Answer 14

epimyseum, perimyseum

endomyseum

Question 15

What is endomyseum?

Answer 15

reticular fibers that surround individual muscle fibers

Question 16

What is perimyseum?

Answer 16

thicker connective tissue surrounding muscle fascicles and there are blood vessels and nerves within it

Question 17

What are myofibrils?

Answer 17

repeating sarcomeres, contractile element of the cell, extend the entire length of the muscle fiber

Question 18

Where does the sarcomere extend to and from?

Answer 18

from Z line to Z line

Question 19

Where is the M line?

Answer 19

in the middle

Question 20

Does the A band change in length during contraction?

Answer 20

no

Question 21

What are the thin filaments?

Answer 21

actin, tropomyosin, troponin

Question 22

What are the thick filaments?

Answer 22

myosin

Question 23

What are 2 characteristics of thick filaments?

Answer 23

2 heavy chains (rods and head), 4 light chains (regulatory)

Question 24

What are some other notable components of a muscle fiber?

Answer 24

sarcoplasmic reticulum, T tubule, nuclei, mitochondria

Question 25

What are progenitor cells?

Answer 25

they are called myoblasts which form myotubes

Question 26

What happens when multiple myotubes fuse?

Answer 26

muscle fibers are formed

Question 27

What do T tubules contain and where are they found?

Answer 27

2 per sarcomere, surround myofibrils

Question 28

Where are intercalated disks?

Answer 28

cardiac muscle