Muscle and Nervous tissue

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Presentation transcript:

Muscle and Nervous tissue Section 5.4-5.5

Objectives To explain the different types of muscle tissue, function and location To explain the function and location of nervous tissue

Muscle tissue Locations: Bones of skeleton Heart Walls of hollow organs

Muscle tissue (cont.) Functions: Movement (through contraction of muscle fibers) Locomotion Maintains posture Produces heat Facial expressions Pumps blood Peristalsis

Muscle tissue (cont.) 1. Skeletal 2. Cardiac 3. Smooth

Skeletal muscle Locations: Functions: Characteristics: Attach to bones Controlled by conscious effort Voluntary Characteristics: Alternating light and dark strands (striations) Multiple nuclei Fibers contract then relax

Cardiac muscle Locations: Functions: Characteristics: Intercalated Disc Nucleus Locations: Only in the heart Functions: Controlled by unconscious effort Involuntary Characteristics: Striated, branched cells Single nucleus Cells joined end to end – intercalated disc

Smooth Muscle Locations: Functions: Characteristics: Wall of hollow organs Ex: stomach, intestine, bladder, uterus, blood vessels etc. Functions: Controlled by unconscious effort Involuntary Characteristics: Shorter Spindle-shaped Single nucleus *no striations

Nervous tissue Location: Functions: Brain Spinal cord Peripheral nerves (*main component of nervous system) Functions: Regulates and controls body functions Generates and transmits nerve impulses Supports, insulates and protects impulse generating neurons

Nervous Tissue (cont.) Basic cells- neurons Neuroglial cells Sense changes through dendrites Transmit impulses via axon to other neurons, glands, or muscles, coordinate and regulate Neuroglial cells Support and bind Phagocytosis Supply nutrients