Muscle and Nervous Tissue

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Presentation transcript:

Muscle and Nervous Tissue Section 5.4-5.5

Objectives explain the various types of muscle tissue, their functions, and locations Identify the location of nervous tissue and explain its function

Muscle Tissue: Locations Attached to bones of skeleton Walls of hollow organs and blood vessels Heart

Muscle Tissue: Functions Moves body parts By contracting muscle fibers Maintains posture Produces heat Pumps blood Make facial expressions Moves food through digestive tract Ex: Peristalsis

3 types of muscle tissue 1. Skeletal 2. Smooth 3. Cardiac

Skeletal Muscle Location: Functions: Characteristics: Attach to the bones (“meat”) Functions: Generate heat Voluntary movement Controlled by conscious effort Characteristics: Long, alternating light and dark strands with striations Fibers contract and relax to produce movement Many nuclei Highly vascularized

Smooth Muscle Location: Functions: Characteristics: Wall of hollow organs Ex: digestive tract, urinary bladder, uterus, etc. Walls of blood vessels Functions: Move materials through the organ Involuntary Controlled by unconscious effort Characteristics: Short, spindle-shaped cells Single nucleus No striations!!

Cardiac Muscle Locations: Heart Only Functions: Moves blood through the heart and the rest of the body Involuntary Controlled by unconscious effort Characteristics: Long, striated, branched cells Single nucleus Cells are connected by intercalated discs (help join cells and help fibers to contract)

Nervous Tissue Location: Functions: Main components of the nervous system Brain Spinal cord Peripheral nerves Functions: Conduct nerve impulses to relay information Regulates and controls body functions Supports, insulates, and protects nerve cells

Nervous Tissue Basic cells = Neurons Neuroglial Cells: Sense changes by dendrites Transmit signals via axon to other cells (muscles, neurons, glands, etc) Neuroglial Cells: Support and bind Conduct Phagocytosis Supply nutrients to nervous tissue Repair and maintain nervous tissue

Activity!! Identify the tissues and the characteristics!

C B A

A B C D E

A B C

A