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Human Body Skeletal, Muscular, and Nervous Systems Unit G in our textbook.

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Presentation on theme: "Human Body Skeletal, Muscular, and Nervous Systems Unit G in our textbook."— Presentation transcript:

1 Human Body Skeletal, Muscular, and Nervous Systems Unit G in our textbook

2 Skeletal System Bones – made of living AND nonliving material 206 bones in body Joint – place where 2 bones meet Ligament – strong bands that hold BONE to BONE

3 Cartilage Examples = nose, ears, padding b/w bones Softer and more flexible than bone than bone Many bones start out as cartilage and slowly turn into bone

4 Jobs: Gives you SHAPE and SUPPORT Allows you to STAND STRAIGHT PROTECTS your organs (heart, lungs, brain) Makes BLOOD cells in the marrow

5 Inside a Bone Periosteum – outer layer Compact bone – very hard Spongy bone – softer (“shock absorbers”) Marrow – makes blood cells periosteum compact bone spongy bone marrow blood vessel

6 Scientific Names of Bones Chart Skeletal System video (4:56)

7 Joints Immovable Bones meet, but no movement Skull Ball and socket Allows great range of motion Hip, Shoulder Hinge Works like a door hinge Knee, Elbow Pivot Able to TURN Neck Gliding One bone slides over another Wrist, Ankle, Spine

8 Muscular System Tendons – attach Muscle to Bone –(The Momma Bear Loves Baby Bear) –(Tendons Muscle-Bone; Ligaments Bone-Bone)

9 Types of Muscles 1.Skeletal – make bones move (V) 2.Smooth – digestive system (I) 3.Cardiac – heart (I) Voluntary- choose to move (jumping, running, kicking) Involuntary – no choice; automatically happens (heart beat, moving food through digestive system) (4:06)

10 Injuries 1. Fracture : break or crack in bone

11 Injuries 2. Sprain : tearing a ligament at a joint

12 Injuries 3. Strain : overstretching or tearing muscle overstretching or tearing muscle

13 Avoiding Injuries Wear PROPER EQUIPMENT tennis shoes, helmets, knee pads, shin guards WARM UP before / COOL DOWN afterwards walk first, then stretch all muscle groups Treat your body with RESPECT A. Eat well – Fruits/Veggies, Milk, limit sweets B. Get enough sleep – 9-11 hours/night C. Stay away from drugs and alcohol Broken bones (24:32)

14 Nervous System 1. Nerves (neurons) 2. Brain 3. Spinal Cord

15 Neurons Neurons - (nerve cells) threadlike cells that send messages to and from the brain Color a neuron!

16 Neurons * Electrical charges cause chemicals to be released from the AXON. * DENDRITES pick up that chemical and the chain continues (as it releases more chemicals from its axon) dendrites axon

17 2 Types of Neurons: 1. Sensory neurons *carry messages from body to brain *allow us to SENSE the environment 2. Motor neurons *carry messages from brain to body *cause MUSCLES to react video (4:00)

18 Nerve Messages Nerve Impulse – message carried through your body by neurons. Sensory Nerve Brain Motor Nerve

19 Spinal Cord Thick, cordlike bundle of nerve cells Protected by vertebrae of spine Connects to brain

20 Reflexes Automatic reactions that skip the brain. Happens without thinking. Reflexes video (0:56)

21 Brain size of both fists weighs 3 pounds gray in color 15 billion nerve cells linked together protected by SKULL, layers of membranes, & fluid Brain video (7:36)

22 3 Parts of the Brain 1. Cerebrum (biggest) has 2 hemispheres (halves) right and left Right side of brain controls left side of body and Left side of brain controls right side of body. Controls voluntary muscles, thinking, memory, decision-making, and more. 1

23 3 Parts of the Brain 2. Cerebellum Below cerebrum Controls balance and posture Coordinates movement 332

24 3 Parts of the Brain 3. Medulla (brain stem) Controls involuntary muscles (breathing, heart beating) Filters all messages going to the brain Fastest acting part Connects to spinal cord 3

25 Citations Fractures. (2007). Retrieved August 1, 2007 from Sprain. (2007). Retrieved August 1, 2007 from Strain. (2007). Retrieved August 1, 2007 from Biceps and triceps, tendons attached. Paul Fuqua (2003). Retrieved August 1, 2007, from unitedstreaming: Nerve with neuron highlighted. Paul Fuqua (2004). Retrieved August 1, 2007, from unitedstreaming: Nerve with neuron highlighted. Paul Fuqua (2004). Retrieved August 1, 2007, from unitedstreaming: In Control: Our Brain and Nervous System. Rainbow Educational Media (1993). Retrieved August 1, 2007, from unitedstreaming: Path of a Nerve Impulse. (2007). Retrieved August 1, 2007 from Spinal Cord. (2007). Retrieved August 1, 2007 from In Control: Our Brain and Nervous System. Rainbow Educational Media (1993). Retrieved August 1, 2007, from unitedstreaming: Brain. (2007). Retrieved August 1, 2007 from structures.jpg structures.jpghttp://medimages.healthopedia.com/large/brain- structures.jpg Broken Bones. Discovery Channel School (2002). Retrieved August 1, 2007, from unitedstreaming:


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