Nervous System http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Nervous System How did our nervous system work in the Impulse Activity we just completed? We sensed the touch. A message was sent to our brain. Our brain sent a message to our muscles. Our muscles squeezed the hand.

Organs of the Nervous System Brain= uses information it receives from nerve impulses to coordinate actions http://commons.wikimedia.org/wiki/File:Brain_headBorder.jpg

Organs of the Nervous System Nerves= carry messages throughout the body http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Organs of the Nervous System Spinal Cord= Central communication system. Nerve center Messages are sent to the brain through the spinal cord. Exception: Reflexes skip the spinal cord and go straight to the brain. http://commons.wikimedia.org/wiki/File:Spinal_cord.gif

Functions of the Nervous System Functions include: Control center Communication network Coordinates all actions and reactions Send messages as electrical impulses http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Functions of the Nervous System Functions include: Allows us to Think Evaluate Remember http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Functions of the Nervous System Functions include: Sensory Input- Senses send messages to the brain. Integration- The brain interprets and translates. Motor Output- The brain sends messages to body. http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Functions of the Nervous System Functions include: – Central Nervous System- Maintains homeostasis by regulating vital body functions such as breathing, heart rate, hormones, etc. http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Functions of the Nervous System Functions include: – Peripheral Nervous System- Sensory Neurons- Carry information toward the central nervous system Motor Neurons- Send impulses away from the central nervous system http://commons.wikimedia.org/wiki/File:TE-Nervous_system_diagram-la.svg

Integumentary System

Integumentary System Composed of skin, hair, sweat glands, and nails The name is derived from the Latin integumentum, which means “a covering.” The skin, considered the largest human organ, covers the body. The hair covers the head and other parts of the body. The nails cover the tops of the fingers and toes. http://upload.wikimedia.org/wikipedia/commons/5/5d/Anatomy_The_Skin_-_NCI_Visuals_Online.jpg

Integumentary System Functions include: Protects the body’s internal tissues and organs against infectious organisms and injury Prevents loss of body fluids http://upload.wikimedia.org/wikipedia/commons/5/5d/Anatomy_The_Skin_-_NCI_Visuals_Online.jpg

Integumentary System Functions include: Regulates body temperature through sweat and regulating peripheral blood flow Removes waste from the body through perspiration Generates vitamin D through exposure to UV light http://commons.wikimedia.org/wiki/File:Fingernails.jpg

Integumentary System Functions include: Protects against sunburns from UV rays Stores fat for fuel and insulation Sensory organ with receptors for touch, pressure, pain, heat, and cold http://commons.wikimedia.org/wiki/File:Human_Hair_10x.JPG http://commons.wikimedia.org/wiki/File:PSM_V71_D115_Cross_section_of_human_skin_displaying_hair_follicles.png

Integumentary System Hair is composed of strong, dead protein called keratin. This same protein makes up the nails and outer layer of skin. Most of the keratin people interact with is dead. The body sheds the old cells as new cells push up from underneath. http://commons.wikimedia.org/wiki/File:Human_Hair_10x.JPG http://commons.wikimedia.org/wiki/File:PSM_V71_D115_Cross_section_of_human_skin_displaying_hair_follicles.png