homeostasis nervous system - AQA BIOLOGY

Alternative transcript:

automatic control systems work? smith gets high Negative feedback whenever the level д (like blood glucose concentration) negative feedback decreases it to return to optimum levels. -If level of smith is too low, negative feedback will increase it. too ↳> basically, negative feedback increasest level to return to optimum y they're too high or low = does opposite of the change. levels. for example: Of we walk into a really cold room, the low temperature will be detected by receptors such as in our skin + the nerous system will then send electrical impuises through neurones to coordination centres. In the coordination centres (such as brain + spinal cord) the information is recieved + processed.- they wordinate a response and send as electrical impulses through. neurones to the effectors.. 3 The effectors (muscles or glands) carry out the approphate response → such as muscles contracting like body shivering (or glands secreting Ireleasing Goverall, its a loop - homeostasis relies on horones) negative feedback. Internal conditions that are maintained ➡ by homeostasis -blood glucose concentration. water levels.. temperature. Nervous system • Structure + funcion →> the Nervous system allows us to react to our surroundings, and coordinate actions in response to stimuli. Receptor cells convert stimulus into an electrical impulse Ⓒ) This electrical impuuse travers along cells called sensory newrones to the Crus (central nervous system) (3) Here, the information is processed + the appropriate response is coordinated, resulting in an electrical impulse being sent along motor neurons to effectors. 14 the effectors carry out the response (this muscles contracting or glands secreting hormones). be may Automatic Responses → called reflex actions. - take place. before you have time to think. → important as they prevent the individual from harm/getting hurt → because the information travels down a pathway. called a reflex are- → responses are rapid as the impolse does not involve the conscious areal part of or brain ↓ A stimulus is detected receptors 2 Impulses are sent along a sensory neurone 3 In the CNS, the impulse passes to a relay 3) Impulses are sent along a motor newtone. Ⓒ The impulse reaches an effector resulting in the approphate response.. neurone. Examples of reflex arcs = moving or hand away from hot surface. to prevent damage. Synapes- gaps between 2 neurons. 4) when impulse reaches end of neuron, a chemical is released into the synapse this chemical diffuses across the synapse