Nervous Tissue.

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Presentation transcript:

Nervous Tissue

Nervous Tissue Main component of nervous system Structure: neuron = dendrite + cell body + axon Function: regulates and controls body functions Location in the body: brain, spinal cord, nerves

Nervous Tissue 2 Major Cell Types: Neurons Respond to stimuli Transmit electrical impulses Other cells Support, insulate, protect neurons

Multipolar neuron Figure 7.8a

Neurons

Neuromuscular Junction

Neuron

Muscle Tissue

Muscle Tissue 3 types: Skeletal muscle Cardiac muscle Smooth muscle

Skeletal Muscle Description: Long, cylindrical Multinucleate (2+ nuclei) Striated (banded appearance) Function: Muscles contract, pull on bones or skin  cause body movements Location in the body: Attached to skeleton Other features: Voluntary control

Myo tendon Striated Muscle Tendon

Smooth Muscle Description: No visible striations 1 central nucleus Spindle-shaped (pointed ends) Function: Propel substances through hollow organs Locations in the body: Walls of organs (stomach, bladder, uterus, blood vessels) Other features: Involuntary control Contracts slowly Peristalsis: wavelike motion that moves food through SI

Cardiac Muscle Description: Striated Uninucleate (1 nucleus) Branching cells – fit at junctions called intercalated discs Function: Propel blood through blood vessels to all parts of body Locations in the body: Walls of the heart Other features: Involuntary control