The Nervous System
- Created by: HavanaPicken
- Created on: 06-10-20 09:32
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- THE NERVOUS SYSTEM
- Central Nervous System (CNS)
- Brain
- Spinal Cord
- Responsible for reflex actions - transfers messages to and from the brain and the rest of the body
- CNS = Responsible for psychological processes + maintaining life
- Peripheral Nervous System (PNS)
- Automatic Nervous System
- Sympathetic Nervous System
- Fight or flight
- Increases: heart rate, glucose, sweat, dilates pupils, dilates bronchi
- Decreases: digestion, saliva
- Parasympathetic Nervous System
- Rest and digest
- Increases: digestion, salica, bile
- Decreases: heart rate, sweat, constricts pupils, constricts bronchi
- Sympathetic Nervous System
- Somatic Nervous System
- Carries sensory and motor information to and from the spinal cord
- PNS = The nerves outside the brain which transmit messages around the body and coordinate the response
- Automatic Nervous System
- Endocrine System
- Pineal Gland
- Melatonin
- Responsible for important biological rhythms
- Melatonin
- Hypothalamus
- Stimulates and controls the release of hormones from the pituitary gland
- Pituitary Gland
- Anterior - ACTH
- Stimulates the adrenal cortex and the release of cortisol during the stress response
- Posterior - Oxytocin
- Responsible for uterus contractions during childbirth
- Anterior - ACTH
- Thyroid
- Thyroxine
- Responsible for regulating metabolism
- Thyroxine
- Pancreas
- Adrenal Gland
- Adrenal medulla - Adrenaline + Noradrenaline
- The key hormones in the fight of flight response
- Adrenal cortex - Cortisol
- Stimulates the release of glucose to give the body energy, while supressing the immune system
- Adrenal medulla - Adrenaline + Noradrenaline
- Ovary/Testes
- Oestrogen
- Controls the regulation of the female reproductive system
- Testosterone
- Responsible for the development of male sex characteristics during puberty + muscle growth
- Oestrogen
- Pineal Gland
- Fight or Flight
- 1. Threat occurs
- Amygdala activated
- 2. Amygdala
- Responds to sensory input - sends distress signal to hypothalamus
- 3. Hypothalamus
- Activates SAM (sympathomedullary pathway)
- 4.Sympathetic nervous system
- SNS prepares body for FoF + stimulates adrenal medulla
- 5. Adrenal medula
- Secretes adrenaline into the bloodstream
- 6. Fight or flight response
- Adrenaline causes physiological changes to prepare body for FoF
- 7. Threat passes
- Relief
- 8. Parasympathetic nervous system
- PNS kicks in
- Parasympathetic Nervous System
- Rest and digest
- Increases: digestion, salica, bile
- Decreases: heart rate, sweat, constricts pupils, constricts bronchi
- Fight or flight
- 1. Threat occurs
- Central Nervous System (CNS)
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