2. The Nervous System
This is a network of cells that carries information to and from all parts of the body.
Two main systems:
Central Nervous System (CNS)
The body’s decision maker
Peripheral Nervous System (PNS)
Gathers information
Transmits CNS decisions to other body parts

3. The Nervous System

4. Central Nervous System Three Types of Neurons
Sensory neuron - a neuron that carries information from the senses to the central nervous system.
Motor neuron - a neuron that carries messages from the central nervous system to the muscles of the body.

5. Central Nervous System Three Types of Neurons
Interneuron - a neuron found in the center of the spinal cord that receives information from the sensory neurons and sends commands to the muscles through the motor neurons.
Interneurons also make up the bulk of the neurons in the brain.

6. CNS: Simple Reflex

7. CNS: Simple Reflex

8. CNS: Simple Reflex

9. ALS – Lou Gehrig’s Disease
Amyotrophic Lateral Sclerosis
Death of motor neurons
Ice Bucket Challenge

10. Peripheral Nervous System
Peripheral nervous system (PNS) - all nerves and neurons that are not contained in the brain and spinal cord but that run through the body itself; divided into two subsystems:
Somatic nervous system
Autonomic nervous system

11. Somatic Nervous System
Soma = body.
Somatic nervous system - division of the PNS consisting of nerves that carry information from the senses to the CNS and from the CNS to the voluntary muscles of the body.
Bell rings, you get up & leave

12. Autonomic Nervous System
Autonomic nervous system (ANS)
Division of the PNS consisting of nerves that control all of the involuntary muscles, organs, and glands.
Sympathetic division (fight-or-flight system)
responsible for reacting to stressful events and bodily arousal.
Parasympathetic division
restores the body to normal functioning after arousal and is responsible for the day-to-day functioning of the organs and glands.

14. The Endocrine System

15. The Endocrine Glands Endocrine glands Hormones
secrete chemicals called hormones directly into the bloodstream.
Hormones
chemicals released into the bloodstream by endocrine glands.
Bloodstream carries them to their target organs.
Hormone chemicals then fit into receptor sites on target organs and excite them to function.

16. (regulates growth and controls other endocrine glands)
- Most influential
(regulates growth and controls other endocrine glands)

17. (regulates growth and controls other endocrine glands)
- Most influential
(regulates growth and controls other endocrine glands)

18. (regulates growth and controls other endocrine glands)
- Most influential
(regulates growth and controls other endocrine glands)

19. (regulates growth and controls other endocrine glands)
- Most influential
(regulates growth and controls other endocrine glands)

20. (regulates growth and controls other endocrine glands)
- Most influential
(regulates growth and controls other endocrine glands)

21. (regulates growth and controls other endocrine glands)
- Most influential
(regulates growth and controls other endocrine glands)
30 different hormones to deal with stress, regulate salt intake, and provide a secondary source of sex hormones. Triggers “fight-or-flight” response.

22. (Parathyroid Hormone) Triiodothyronine & Thyroxine
- Most influential
(regulates growth and controls other endocrine glands)
Oxytocin
PTH
(Parathyroid Hormone)
Triiodothyronine & Thyroxine
Epinephrine & Norepinephrine
30 different hormones to deal with stress, regulate salt intake, and provide a secondary source of sex hormones. Triggers “fight-or-flight” response.
Insulin
Testostrone
Oestrogen & Progesterone

23. Immune System Endocrine system linked to immune system. Immune system
system of cells, organs, and chemicals in the body that responds to attacks on the body from disease and injuries.

24. Immune System Thymus gland
located near the top of the sternum that produces hormones to help fight off infections and diseases.