Muscular Sys.

Question 1

Skeletal

Answer 1

Vol.

Question 2

Cardiac

Answer 2

Invol.

Question 3

Smooth

Answer 3

Invol.

Question 4

Myosin

Answer 4

Thick filaments

Question 5

Actin

Answer 5

Thin filaments

Question 6

Ca++ / calcium (What happens when muscles release this)

Answer 6

When Ca++ binds to troponin it shifts tropomyosin to expose active sites which allows myosin to bind

Question 7

What are sarcomeres composed of

Answer 7

Z-lines,
Strands of Actin (with tropomyosin and troponin)
Myosin

Question 8

Myofibril

Answer 8

Strand of multiple sarcomeres

Question 9

Muscle fiber (cell) what is it composed of

Answer 9

Myofibrils,
Organelles (specific SR- sarcomeres reticulum Ca++ storage)
Sarcolemma membrane
Endomysiom (covering)

Question 10

Fascicle

Answer 10

Muscle fiber cells covered by perimysium

Question 11

Muscle

Answer 11

Fascicles covered by epimysium …

Covered by Fascia

Question 12

Fascia

Answer 12

Groups muscles with similar jobs together,

Helps perform specific functions, CT, attaches muscles to skin

Question 13

Tendons

Answer 13

Endomysiom, perimysium, and epimysium

Question 14

NMJ

Answer 14

Neuromuscular junction:

Motor neuron, synapse, synaptic cleft, Ach, synaptic bulb, motor end plate, Ach receptors, muscle fiber

DRAW OUT

Question 15

Transmitter example

Answer 15

Ach

Question 16

Threshold

Answer 16

Min. Amount

Question 17

Excitability

Answer 17

A muscle cell can be stimulated by a nerve to contract

Question 18

Conductivity

Answer 18

The stimulation from the nerve moves quickly along the length of the muscle

Question 19

Contractility

Answer 19

A muscle cell can shorten with force, muscles can only pull (not push)

Question 20

Extensibility

Answer 20

A muscle cell can be stretched,

Example
Biceps brachii contracts to flex the arm, the triceps brachii needs to stretch to accommodate the motion

Muscles are stretched by the contraction of other muscles

Question 21

Elasticity

Answer 21

If a muscle cell is stretched, it will return to it’s original shape

Question 22

Sliding filament theory

Answer 22

Muscle contraction involves thick filaments grabbing thin filaments and pulling therm toward the center of the sarcomeres

Question 23

Twitch

Answer 23

Contraction of a muscle cell in response to single nerve stimulus
Latent, contraction, relaxation, refractory

Question 24

Tetany

Answer 24

Sustained contraction due to repetitive nerve signals

Question 25

Isotonic contraction

Answer 25

Push up

Tension in the muscle remains constant as the muscle shortens

Question 26

Isometric contraction

Answer 26

Planking,

Tension in the muscle increases, but there is no shortening of the muscle

Question 27

Levers in the human body (most common)

Answer 27

Third class levels

Question 28

02 not provided

Answer 28

Anaerobic, lactic acid

Question 29

O2 provided

Answer 29

Peruvate, H20 and CO2

Question 30

Anaerobic respiration results in …

Answer 30

Peruvic acid

Question 31

Slow-twitch fibers

Answer 31

Aerobic respiration, do not fatigue quickly

Question 32

Fast twitch fibers

Answer 32

Anaerobic respiration and therefore fatigue quickly

Question 33

Sprain

Answer 33

Tear in ligament

Question 34

Strain

Answer 34

Tear in tendons or muscle tissue

Question 35

Synergists

Answer 35

Muscles that have the same action

Question 36

Antagonist

Answer 36

Muscles that have opposing action