Central vs. Peripheral Nervous System
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1 Nervous System 2 C 1 2 : A N A L Y Z E T H E F U N C T I O N A L I N T E R R E L A T I O N S H I P S O F T H E D I V I S I O N S O F T H E N E R V O U S S Y S T E M
2 Central vs. Peripheral Nervous System Location Function(s) Central Nervous System (CNS) Includes the brain & spinal cord Brain receives, coordinates, and interprets nerve impulses Spinal cord is the centre for reflex actions & a communication link between the brain & spinal nerves Peripheral Nervous System (PNS) Includes all of the nerves that extend out from the CNS Collects stimuli to bring to the CNS & conducts impulses away from the CNS 2 parts: the autonomic nervous system (involuntary) & the somatic nervous system (voluntary)
3 Brain Parts & Functions Medulla Oblongata: located in the brain stem, controls involuntary actions such as heart rate and breathing.
4 Brain Parts & Functions Cerebrum: the largest portion of the brain with a left & right side, this is the central processing area. Responsible for memory, conscious thought, voluntary movement, intellect, artistic & creative abilities, and learning
5 Brain Parts & Functions Thalamus: receives impulses from the spinal cord and directs them to the appropriate region of the cerebrum. (acts as a sorting centre)
6 Brain Parts & Functions Cerebellum: responsible for muscle coordination, balance & coordination
7 Brain Parts & Functions Hypothalamus: maintains homeostasis in the body monitors things like body temperature, hunger, sleep, thirst, water balance, and blood pressure. Controls the pituitary gland acts as a link between the nervous system & the endocrine system
8 Brain Parts & Functions Pituitary Gland: located just below the hypothalamus Works with the hypothalamus to regulate certain body responses through the release of hormones including ADH, oxytocin, FSH, LH, and thyroid stimulating hormone.
9 Brain Parts & Functions Corpus callosum: conducts impulses from one side of the brain to the other so that left and right brain activities are coordinated.
10 Brain Parts & Functions Meninges: The brain & spinal cord are surrounded by 3 protective membranes called the meninges Meningitis is an infection of these membranes The spaces between the meninges are filled with cerebrospinal fluid which cushions & protects the CNS.
11 Neuroendocrine Control Centre Made up of the hypothalamus and the pituitary gland (anterior & posterior pituitary)
12 Hypothalamus & Posterior Pituitary Neurosecretory cells in the hypothalamus produce ADH & oxytocin ADH & oxytocin move to the posterior pituitary where they are stored until needed The hypothalamus monitors the blood and will stimulate the posterior pituitary to release ADH if blood is low in water or too concentrated. This works via a negative feedback mechanism Oxytocin release is controlled by positive feedback (childbirth &breastfeeding)
13 Negative Feedback
14 Hypothalamus & Anterior Pituitary The anterior pituitary produces many of its own hormones The hypothalamus produces pituitary stimulating hormones that cause the anterior pituitary to release particular hormones that target a variety of organs in the body. Examples of anterior pituitary hormones include thyroid stimulating hormone (causes thyroid to produce thyroxin), growth hormones, LH, and FSH Release of anterior pituitary hormones is controlled by negative feedback.
15 Autonomic vs. Somatic Divisions of the Peripheral Nervous Systems Functions Autonomic Nervous System Controls involuntary responses to stimuli Acts to maintain homeostasis & reacts to stress Divided into 2 sections: the sympathetic and parasympathetic divisions Somatic Nervous System Controls voluntary movement of skeletal muscles (walking, running, note-taking...) Facilitates reflex actions that involve skeletal muscles (when you touch something hot)
16 Sympathetic vs. Parasympathetic Divisions of the Autonomic Nervous System Sympathetic Parasympathetic Heart Rate Increased Decreased Breathing Rate Widens air Decreased passages Increased Pupil Size Increased Decreased Digestion Decreased Activity Increased Activity Neurotransmitters Noradrenalin Acetylcholine Overall Response fight or flight Relaxed state
17
18 Fight or Flight Response Release of noradrenalin from sympathetic neurons causes the release of adrenalin from the medulla of the adrenal glands Noradrenalin + adrenalin initiates the fight Noradrenalin + adrenalin initiates the fight or flight response to prepare the body to respond to perceived danger
19 5 Steps of fight or flight 1. Increased heart rate so more blood is supplied to the body quickly 2. Altering blood flow patterns reduced flow to surface tissues & digestive system and increased flow to skeletal muscles 3. Widening of air passages increased air exchange 4. Contraction of skeletal & other muscles tenses the body up for action 5. Contraction of irises to widen pupils maximize visual alertness
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