tissues –group of cells with a common structure and function –types epithelial- lines body...
TRANSCRIPT
Tissues
• Tissues– Group of cells with a common structure and function
– Types• Epithelial- Lines body surfaces; protection and prevents
dehydration• Nervous- nerve cells; body communication• Connective- support, connect, and insulate; fat, bone,
tendons, blood…• Muscle- enable movement; skeletal (conscious control),
smooth (involuntary), cardiac (heart)
Organs
• Organs- 2 or more types of tissues together to perform a specific function.
• We will cover…– Nervous– Circulatory– Respiratory– Digestive– But there’s more!!!!!!
Nervous System
• Made of neurons– Nerve cells that transmit info through the body
Structure
Dendrites
Cell Bodies
Axons
Myelin Sheath
C
B
A
How the neurons work
• Transmit an electrical impulse through neuron
• Each neuron has a resting potential
• When neuron carries a charge it reverses its resting potential (called Action Potential)
How the neurons work (cont..)• Electrical impulse goes
through axon to end of neuron
• Where the neuron meets another cell is called a synapse
• There is a gap at the synapse
• To transmit the signal through the gap, the neuron releases neurotransmitters
Drugs
• Many drugs prevent the reuptake of neurotransmitters (which means there is more molecules in between neurons) = feeling good– Cocaine (dopamine), Prozac (seratonin) (many anti-
depressants)…• Some mimic neurotransmitters
– Morphine, Codeine, Heroin (many pain killers)….• Some decrease neuron activity
– Alcohol
Nervous System Organization-Interprets and processes info
• Central Nervous system• Brain
– Cerebrum, Cerebellum, Brainstem
• Spinal Cord
1
2
3
Peripheral Nervous System
• Motor nerves – Send command from
CNS to muscles, etc.
• Sensory nerves– Send commands from
skin, etc. to CNS
How your body basically works.
• So Nerves essentially carry electricity• What happens when you get shocked?• What happens to your muscles when
shocked?• When you think, electricity is made. The
signal goes to your muscle, making it contract.
• What are your muscles connected to?• Therefore….
Your major bones
A
B
C
D
E
F
G
H
I
J
KL
Skull
ClavicleScapula
Humerus
Radius
Ulna
“Carpals””
Femur
Tibia
Fibual
Tarsals
Ribs
Sternum
M
Pelvic Girdle N
Patella O
Knee Problems
• http://www.aclsolutions.com/anatomy.php
• http://health.allrefer.com/pictures-images/acl-injury.html