Muscular Tissue

Question 1

major properties of muscle tissue

Answer 1

excitability, contractility, extensibility, elasticity

Question 2

excitability

Answer 2

can receive and respond to stimulus

Question 3

contractility

Answer 3

can contract given adequate stimulus

Question 4

extensibility

Answer 4

can stretch without damaging the tissue

Question 5

elasticity

Answer 5

can return to its original state after being stretched `

Question 6

functions of muscles

Answer 6

provide movement, posture, heat and stabilise joints

Question 7

skeletal muscle

Answer 7

allows for voluntary movement

Question 8

cardiac muscle

Answer 8

allows for the heart to beat involuntarily

Question 9

smooth muscle

Answer 9

allows movement of food, urine and blood

Question 10

how does skeletal muscle result in fine motor movement

Answer 10

because it is compartmentalised by connective tissue ,and different muscles work together to produce the final movement

Question 11

differences between the types of muscle

Answer 11

skeletal - voluntary, striated, tire quickly
cardiac - involuntary, striated, do not tire
smooth - involuntary, non-striated, do not tire

Question 12

connective tissue layer that surrounds each cell ,fascicle, muscle and group of muscle

Answer 12

muscle fibre bound by endomysium
fascicle (bundle of muscle fibres) bound by perymysium
multiple fascicles bound by epimysium

Question 13

organisation of skeletal muscle tissue

Answer 13

actin/myosin -> myofibril -> muscle fibre
actin and myosin make up sacromeres
each fibre is surrounded by endomysium, which is connective tissue

Question 14

z-line

Answer 14

where actin is anchored

Question 15

h zone

Answer 15

where myosin is anchored

Question 16

I band

Answer 16

thin filament that goes over z disc

Question 17

A band

Answer 17

overlapping area of actin and myosin. contracting part of the sarcomere

Question 18

changes in a sarcomere during contraction

Answer 18

h zone pulls z line as myosin pulls actin. pulling is due to the formation of cross bridges

Question 19

Excitation-Contraction Coupling process

Answer 19

A - action potential 
C - calcium relase
T - troponin activated
T - tropomyosin released
C - cross bridge
P - power stroke
R - reset

Question 20

sliding filament theory

Answer 20

the actin and myosin bind to create cross-bridges and slide past one another, creating a contraction.

Question 21

latent period

Answer 21

excitation, contraction occurs

Question 22

contraction period

Answer 22

cross bridges are created - creating tension and contraction

Question 23

relaxation period

Answer 23

calcium transported back into SR, cross bridge cycling ends and tension is decreased