An Organ Consists of

question 115

Multiple Choice

An organ consists of

• A)skin and bones.
• B)two or more tissues grouped together that function together.
• C)at least four tissues grouped together that function together.
• D)one variety of each of the four tissue types.

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Definitions:

Acetylcholine

Acetylcholine is a neurotransmitter involved in many functions including muscle activation, heart rate regulation, and the modulation of brain function.

Graded Potential

A shift in electrical charge across a neuron's membrane, varying in magnitude, that can initiate an action potential if it reaches a threshold.

Action Potential

A rapid, temporary change in a membrane potential across a cell's membrane, leading to the transmission of nerve impulses.

Spatial Summation

The summing of several postsynaptic potentials resulting when several presynaptic neurons release neurotransmitter simultaneously. Compare with temporal summation.