Unit 3 Exam Chapter 8

Question 1

Stabilizes joints to allow other movements

Answer 1

Fixator must action

Question 2

Generates impulse to start each heartbeat

Answer 2

Sinoatrial node (SA Node)

Question 3

Muscle attachment site the undergoes the most movement when muscles contract

Answer 3

Origin of a muscle

Question 4

Need for oxygen exceeds the amount available

Answer 4

Anaerobic metabolism

Question 5

Attach muscles to bones or other muscles by broad sheets of fibrous tissue

Answer 5

Aponeurosis

Question 6

A series of protein filaments that make up contractile units of muscle cells

Answer 6

Sarcomere

Question 7

attach muscles to bones by fibrous tissue bands

Answer 7

Tendon

Question 8

contracts at the same time as agonist to assist its action

Answer 8

Synergust muscle action

Question 9

end to end attachment sites between adjacent cardiac muscle cells

Answer 9

Intercalated Discs

Question 10

groups of skeletal muscle fibers

Answer 10

Fascicle

Question 11

where the left and right parts of the abdominal skeletal muscles come together

Answer 11

Linea Alba

Question 12

site where ends of motor nerve fibers connect to muscle fibers

Answer 12

Neuromuscular Junction

Question 13

adequate oxygen supply for energy needs of muscle fiber

Answer 13

Aerobic Metabolism

Question 14

many sarcomeres lined up end to end

Answer 14

Myofibril

Question 15

tough, connective tissue layer that covers the entire muscle

Answer 15

Epimysium

Question 16

directly produces a desired movement

Answer 16

Agonist muscle action

Question 17

shortening of all sarcomeres in a muscle fiber

Answer 17

Muscle contraction

Question 18

delicate connective tissue layer surround each individual skeletal muscle fiber

Answer 18

Endomysium

Question 19

muscle attachment site that undergoes the most movement when muscles contract

Answer 19

Insertion of a muscle

Question 20

tough, connective tissue that covers groups of skeletal muscle fibers

Answer 20

Perimysium

Question 21

directly opposes the action of an agonist

Answer 21

Antagonist muscle action

Question 22

Which contractile protein filaments make up the dark bands of skeletal muscle cells?

Answer 22

Myosin

Question 23

Which contractile protein filaments make up the light bands of skeletal muscle cells?

Answer 23

Actin

Question 24

What ion, released from the sarcoplasmic reticulum by a nerve impulse, starts the contraction process in a muscle fiber?

Answer 24

Calcium

Question 25

What molecule in muscle act as the “batteries” to power the sliding of the actin and myosin filaments?

Answer 25

ATP

Question 26

What molecules function as the “battery chargers” to recharge the “Batteries” for sliding of the actin and myosin filaments?

Answer 26

ADP

Question 27

What is the all or nothing principle for muscle contraction?

Answer 27

When stimulated, individual fiber contracts completely, or not at all

Question 28

What is the effect of the sympathetic nervous system on cardiac muscle?

Answer 28

Heart beats faster and harder

Question 29

What is the effect of the parasympathetic nervous system on cardiac muscle?

Answer 29

Heart beats slower and with less force

Question 30

Which of the following organs would have visceral smooth muscle in their walls?

Answer 30

Intestines

Question 31

Which of the following would have multiunit smooth muscle?

Answer 31

Ciliary body of the eye

Question 32

What are the two ways that animals control the heat produced from muscle contraction?

Answer 32

Panting, Shivering

Question 33

What are the 6 different muscle-naming conventions?

Answer 33

Action, Shape, location, Direction of fibers, # of heads or divisions, Attachment Sites