Muscular Sysyem & Nerves PHYSIOLOGY

Question 1

Muscle Movement Requires

Answer 1

Many nerves, fibers & adenosine triphosphate (ATP) to POWER contraction

EACH Muscle Fiber is CONNECTED to a Nerve Fiber*

Question 2

Muscle Movement Part 1

Answer 2

Motor signal sent by brain (PNS) travels down spinal cord through a Motor Neuron

Question 3

Muscle Movement Part 2

Answer 3

Motor Neuron releases the neurotransmitter ACETYLCHOLINE in the sarcolemma

Question 4

Muscle Movement Part 3

Answer 4

Acetylcholine causes rapid shifts in ions across sacrolemma into T-Tubules

Brings calcium into Myocyte

Question 5

Muscle Movement Part 4

Answer 5

When calcium flows into Myocyte > Actin & Myosin bind & pull in on each other causing thousands of SACROMERES to contract all at once

MUSCLE CONTRACTS

Question 6

Muscle Contraction

Answer 6

Actin & Myosin bind & pull together

Leading to shortening / tension of a muscle

Question 7

Muscle Relaxation

Answer 7

Actin & Myosin filaments are NOT attached

Relaxes muscle fibers

Question 8

Receptors in Muscles

Answer 8

Allow muscles to receive a signal & responds with the appropriate magnitude & movement

Question 9

Disruptive Receptors in Muscles

Answer 9

Signal and/or Response disrupted = a disorder

Ex) muscle sprain/strain, muscular dystrophy, muscular sclerosis