Homeroom
Read or complete any missing assignments!
Complete the “Body’s Communication”
worksheet in your notebook.
Write the Stimuli in your notebook, then
write how you would respond to each one.
Warm-up
• What does the skin of an apple do for the
apple?
• What does it prevent?
Think about an apple.
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Consists of 3 things:
Skin
Hair
Nails
Integumentary System
• Flat sheets of cells
• Protects your body from outside
materials
skin
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Repels water
Guards against infection
Helps maintain homeostasis
Senses the environment
vital functions of skin
The Skin
• Sweat glands help control body
temperature
• Present almost everywhere
• Oil glands give moisture to skin and hair
• Keep liquids from entering
Sweat and oil glands
• Skin grows at the base of the epidermis
• Skin cells grow and divide
• Dead cells are brushed off
Healing and Growth
• Gives the brown color in the skin
• Made by melanocytes in the epidermis
Melanin
• Your skin contains sensory receptors
• Tell you when something is hot or cold
• Part of your nervous system
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5 types
Heat
Cold
Pain
Touch
Pressure
Sensory Receptors
• Stimulus: Change to your
environment that you react to.
• Could be any of your 5 senses
Nervous System
• Consists of the brain and spinal cord
• Communicates with the rest of the nervous
system through electrical signals sent through
nerve cells.
Central Nervous System
• Nerve cells
• Brain contains at least 10 billion
Neuron
• Main pathway for information
• Connects the brain and nerves throughout
the body.
• 31 pairs of nerves extend from the spinal
cord.
• It weighs a little over a pound
• 17 inches long
Spinal Cord
• Nerves found throughout the body
• Sensory Nerves: receive information from
the environment (hot or cold)
• Motor Nerves: send signals to your
muscles that allow you to move
• Voluntary and involuntary!
Peripheral Nervous System
• Autonomic: controls the movement of the
heart, the smooth muscles in the stomach,
the intestines, and the glands.
• Voluntary: Monitors movement that can be
controlled consciously.
Autonomic vs. Voluntary
• Read over all directions on the Lab.
• With your piece of candy, fill out the table
using your senses.
• Complete the 2 questions on the bottom of
the page.
Candy Lab