Homework Due Next Class Chapter 31.2 – The Central Nervous System Take notes Be ready to discuss next class
Review Constant communication is happening between the 2 nervous systems You’re walking around in the dark and can’t see anything. Your hands are reaching for the light switch and your PNS relays the message of what it is touching to the CNS, which relays back to the PNS as to what it is supposed to be looking for.
Major Areas of the Brain Cerebrum Cerebellum Brain Stem
Brain Changes Sensory experience changes the patterns of neuron connections in the brain What does this mean?
Parts of the Brain Cerebrum – The area of the brain that is the site of intelligence and learning Cerebellum – Coordination of muscles and movement Brain stem – The body’s functions continue when you are asleep or unconscious Thalamus and hypothalamus – Areas of the brain located between the brain stem and the cerebrum Limbic System - Emotions, behavior and memory
Thalamus/Hypothalamus Thalamus – receives messages from sensory receptors throughout the body and then relays the information to the proper regions of the cerebrum Hypothalamus – Control center for recognition and analysis of hunger, thirst, fatigue, anger and body temp.
Hypothalamus Directly works with the Endocrine System Controls what the hormones do, and where they go Controls the Pituitary gland, which secretes hormones Pituitary Gland is the “Master Gland” Controls the Adrenal Gland, which sits on top of each kidney
Adrenal Gland Helps respond to stress Produces cortisol Too much cortisol, Cushing’s Syndrome Too little cortisol, Addison’s Disease Cortisol increases blood sugar, suppresses the immune system and aids in fat, protein and carbohydrate metabolism Decreases Bone formation How can this present problems?
Cushing’s Syndrome Some tumors secrete hormones, releasing too much cortisol Symptoms are: Upper body obesity Thin arms and legs Severe fatigue and muscles weakness High BP High Blood sugar Easy Bruising Potential risks?
Addison’s Disease Occurs when not enough cortisol is created (helping control the body’s stress response) Immune system mistakenly attacks your own tissues Symptoms include: Weight loss Muscle fatigue Low blood pressure Patchy, dark skin
The Spinal Cord The spinal cord is the major link between the brain (the HUB of processing) and the PNS 31 pairs of spinal nerves branch out from spinal cord Reflexes are quick, automatic responses to a stimulus Who wants to learn/have their reflexes tested?
Homework Due Next Class Read Chapter 31.2 Take notes Be ready to discuss next class