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Nervous, muscular, and skeletal systems
Transcript of Nervous, muscular, and skeletal systems
How do the nervous, muscular,
and skeletal systems
Do Now: Review from yesterday--How do the digestive, respiratory, and circulatory systems work together? Functions:
1. Forms our body frame
2. Anchors and supports muscles and organs
3. Protects our vital organs
4. Allows us to move!
5. Allows our body to store fat and minerals,
make new blood cells Skeletal system Muscular system Involuntary muscles keep us breathing,
our heart beating, and moves food
through our digestive system.
Voluntary muscles allow us to move. Nervous system Coordinates all activities in your body
(Ex: Breathing, digesting food, sensing pain,
Made up of brain, spinal chord, and nerves. Nerves constantly send messages to your brain about your senses (heat, sound, touch, sight, etc.)
When you feel pain, nerves send a message to your brain, which tells your muscles to contract and move your body part away from danger. By Ms. Drame Nervous, Muscular,
and Skeletal Systems Example: What is involved in catching a ball? You see the ball coming towards you. You also see and feel the position of your arms and hands.
As your brain sends signals to move the arms and hands, it also receives sensory information feedback. As the ball gets closer, the brain uses visual information about the ball, and sensory information about your body position, to move your arms and hands to the correct position.
As the ball hits your hands, your brain signals your hands and fingers to close around the ball. What about reflexes? A reflex is an involuntary action that our body does without thinking.
Examples: pulling your hand away from a hot object and closing your eyes when you look into a bright light.
Reflexes are controlled by the spinal cord. It works when our nerves send a message to the spinal cord, skipping the brain. The spinal cord sends a quick message to the muscle telling it to react.
Reflexes are fast because they don't travel all the way to the brain! Reflex action Quick review:
point out locations of a joint, ligament, and tendon to your neighbor. Quick Review:
Three types of muscles:
1. Smooth (in your organs)
2. Cardiac (heart)
3. Skeletal (connected to your skeleton)
Which ones are involuntary and which are voluntary?