Test 3 (Muscle Tissue)

Question 1

Makes up muscular system

Answer 1

Skeletal muscle

Question 2

Found only in the heart

Answer 2

cardiac muscle

Question 3

Appears throughout the body systems as components of hollow organs and tubes

Answer 3

smooth muscle

Question 4

Single skeletal muscle cells

Answer 4

muscle fiber

Question 5

Number of muscle fibers bound by connective tissue

Answer 5

muscle

Question 6

Connective tissue surrounding a single muscle fiber

Answer 6

endomysium

Question 7

Connective tissues surrounding its facile

Answer 7

Perimysium

Question 8

Surround entire muscle

Answer 8

Epimysium

Question 9

Cell membrane of the muscle fiber

Answer 9

sarcolemma

Question 10

Site where a motor neuron stimulates muscle fiber

Answer 10

neuromuscular junction

Question 11

Area of the muscle fiber sarcolemma where a motor neuron stimulates it using the neurotransmitter, acetylcholine

Answer 11

Motor end plate

Question 12

Contractile elements of muscle fiber

Answer 12

Myofibrils

Question 13

Function unit between 2 Z lines

Answer 13

Sarcomere

Question 14

What is the main protein component of thick filaments?

Answer 14

Myosin

Question 15

What is on the myosin heads?

Answer 15

actin binding sites

ATP binding site

Question 16

What are the 2 regulatory proteins in thin filaments?

Answer 16

Tryomyosin

Troponin

Question 17

Lies alongside groove of actin and covers myosin binding sites blocking interaction

Answer 17

Tropomyosin

Question 18

Functions of ATP in contraction

Answer 18

Energizes X-bridge, providing energy for force

Binding of ATP disassociates X-bridge from actin

Question 19

How is calcium released?

Answer 19

AP propagated into interior of fiber along transverse tubules to sarcoplasmic reticulum

Opening of voltage gated channgels

Question 20

Force exerted on an object by contracting muscle

Answer 20

Tension

Question 21

Force exerted on the muscle by weight of object

Answer 21

Load

Question 22

Mechanical response of a single muscle fiber to a single AP

Answer 22

Twitch

Question 23

The time between stimulus and contraction

Answer 23

Latent period

Question 24

Force Velocity Curve

Answer 24

For muscles to contract, they must generate force that is greater than the opposing forces

Question 25

Two primary types of muscle contraction

Answer 25

Isotonic

Isometric

Question 26

Change in muscle length

Answer 26

Isotonic

Question 27

Concentric Contractions

Answer 27

Muscle shortens

Question 28

Eccentric contractions

Answer 28

Muscle lengthens

Question 29

Muscles can’t shorten because the load is too great

Answer 29

Isometric

Question 30

What is the motor unit?

Answer 30

Motor neuron and the muscle fibers it innervates

Question 31

How do you control muscle tension?

Answer 31

amount of tension developed by each fiber

Number of fibers contracting at any time

Question 32

Increasing the number of active motor units

Answer 32

Recruitment (increases velocity)

Question 33

How do you control the amount of tension developed in a skeletal muscle?

Answer 33

Frequency of stimulation

Question 34

Muscle fiber is stimulated so rapidly that it does not have a chance to relax between stimuli

Answer 34

Tetanus

Question 35

What are the major types of muscle fibers?

Answer 35

slow oxidative fibers
fast oxidative fibers
fast glycolytic fibers