joints are divided into three classes according to the degree of movement they permit:

synarthroses (immovable), amphiarthroses (slightly movable), and diarthroses (freely movable)

FIBROUS JOINTS (SYNARTHROSES)

joints in which fibrous bands (ligaments) connect two bones.

CARTILAGINOUS JOINTS (AMPHIARTHROSES)

joined together by either hyaline cartilage or fibrocartilage

SYNOVIAL JOINTS (DIARTHROSES)

freely movable joints. They are not only the body’s most mobile but also its most numerous and anatomically most complex joints. A majority of the joints between bones in the appendicular skeleton

“muscle fibers" are also known as

Muscle cells or myocytes are most frequently called

the membrane potential of an active neuron that is conducting an impulse. also known as the nerve impulse - electrical fluctuation that travels along the surface of a neuron’s plasma membrane.

Movement of the membrane potential away from zero (thus be-low the usual RMP)

The opening of stimulus-gated Na+ channels in response to a stimulus permits more Na+ to enter the cell. As the excess of positive ions outside the plasma membrane decreases, the magnitude of the membrane potential is reduced.

a brief period during which a local area of an axon’s membrane resists restimulation. For about 0.5 ms after the membrane surpasses the threshold potential, it will not respond to any stimulus, no matter how strong.

occurs when K+ channels then open, allowing K+ to move to an area of lower concentration (and more negative charge) outside the cell—reversing the polarity back to an inside-negative state.

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Nabiha Khashan

Physiology Week 1-6

Question	Answer
joints are divided into three classes according to the degree of movement they permit:	synarthroses (immovable), amphiarthroses (slightly movable), and diarthroses (freely movable)
FIBROUS JOINTS (SYNARTHROSES)	joints in which fibrous bands (ligaments) connect two bones.
CARTILAGINOUS JOINTS (AMPHIARTHROSES)	joined together by either hyaline cartilage or fibrocartilage
SYNOVIAL JOINTS (DIARTHROSES)	freely movable joints. They are not only the body’s most mobile but also its most numerous and anatomically most complex joints. A majority of the joints between bones in the appendicular skeleton
“muscle fibers" are also known as	Muscle cells or myocytes are most frequently called
action potential	the membrane potential of an active neuron that is conducting an impulse. also known as the nerve impulse - electrical fluctuation that travels along the surface of a neuron’s plasma membrane.
hyperpolarization.	Movement of the membrane potential away from zero (thus be-low the usual RMP)
depolarozation	The opening of stimulus-gated Na+ channels in response to a stimulus permits more Na+ to enter the cell. As the excess of positive ions outside the plasma membrane decreases, the magnitude of the membrane potential is reduced.
refractory period	a brief period during which a local area of an axon’s membrane resists restimulation. For about 0.5 ms after the membrane surpasses the threshold potential, it will not respond to any stimulus, no matter how strong.
Repolarization	occurs when K+ channels then open, allowing K+ to move to an area of lower concentration (and more negative charge) outside the cell—reversing the polarity back to an inside-negative state.

Created by: IGEMINI81

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