Muscular System

Question 1

Skeletal muscle: Body location, microscopic anatomy, regulation of contraction, speed of contraction, rhythmicity

Answer 1

Around the skeleton attached to bones by tendons
striated, single, long, multinucleate, cylonical
voluntary
slow to fast
no

Question 2

Cardiac muscle: Body location, microscopic anatomy, regulation of contraction, speed of contraction, rhythmicity

Answer 2

Walls of heart
Chains of multinucleate cells, striations, and intercalated discs
involuntary 
slow
yes

Question 3

smooth muscle: Body location, microscopic anatomy, regulation of contraction, speed of contraction, rhythmicity

Answer 3

walls of hollow organs
single, multinucleate, no striations 
involuntary
very slow
yes, in some

Question 4

Events that occur from the time that motor neurons release acetylcholine at the neauronmuscular junctions for muscle contractions

Answer 4

Acetylcholine is released and attaches receptors onto sarcolemma.
Sarcolemma allows sodium ions to enter the muscle and changing the electrical conditions.
An action potential is initiated and sodium is released, attaching to microfilaments, which triggers their sliding and causes muscle contraction.

Question 5

Sliding filament theory of muscle contraction

Answer 5

1. Muscle activation: break down of energy (ATP) by myosin
2. Muscle contraction: cross bridge formation, shape allowing myosin to bind on an adjacent actin
3. recharging: Power (pulling) stroke causing myosin to release ADP+P, changing shape and pulls actin closer to the center of the myosin muscle
4. Relaxaction: cross bridge detachment, myosin, and atp bind and destroy the cross bridge