Anatomy And Physiology: Muscular System Physiology

Front 1

Contractility:

Back 1

Ability of a muscle to shorten with force

Front 2

Excitability:

Back 2

Capacity of muscle to respond to a stimulus (from our nerves)

Front 3

Extensibility:

Back 3

Muscle can be stretched to its normal resting length and beyond to a limited degree

Front 4

Elasticity:

Back 4

Ability of muscle to recoil to original resting length after stretched

Front 5

Connective Tissue Coverings of Muscle:

(Outside in)

Back 5

• Muscular Fascia: Holds muscles together
• Epimysium: Surrounds a whole muscle
• Perimysium: Surrounds group of muscle fibers
• Endomysium: Surrounds each muscle cell

Front 6

Two Myofilaments involved in the Sliding Filament Model of muscle contraction?

Back 6

• Actin: Thin filament
• Myosin: Thick filament

Front 7

Whole Molecule of Actin called?

Back 7

F actin

Front 8

F actin is made up of small sub units called?

Back 8

G actin

Front 9

G actin active sites?

Back 9

Where myosin will latch on and articulate with actin

Front 10

Two regulatory proteins involved in Sliding Filament Model of muscle movement?

Back 10

1. Troponin
2. Tropomyosin

Front 11

Resting Membrane Potential:

Back 11

Slight negative charge inside muscle cells with respect to the outside of cell

Front 12

Two Types of Ion Channels in Muscle Cells:

Back 12

1. Ligand-gated
2. Voltage-gated

Front 13

Ligand-gated Ion Channel

Back 13

Channels that respond to molecules that bind to receptors

Front 14

Voltage-gated Ion Channel

Back 14

Open and close in response to small voltage changes across plasma membrane

Front 15

Neuromuscular Junction

Back 15

Synapse between a motor neuron and a skeletal muscle

Front 16

Three major parts of the Neuromuscular Junction:

Back 16

1. Presynaptic terminal
2. Synaptic Cleft
3. Postsynaptic membrane or motor end-plate

Front 17

Sarcomere

Back 17

A unit of contractile in a striated muscle cell defined from one Z disk to the next adjacent Z disk

Front 18

Z disk

Back 18

Anchoring point of actin filaments at either end of the sarcomere

Front 19

M line

Back 19

Dark band in middle of Sarcomere

Front 20

A Band

Back 20

Dark band of sarcomere that contains Myosin filaments

Front 21

I Band

Back 21

Light band of sarcomere that contains Actin Filaments

Front 22

Troponin

Back 22

Regulatory protein that interacts with tropomyosin to control the binding of myosin to actin

Front 23

Transverse Tubules

Back 23

Deep invagination of the sarcolemma which allow depolarization of the membrane to quickly penetrate to the interior of the cell