Neurones Study guides, Class notes & Summaries

Role of neurones - Answer To transmit electrical impulses rapidly around the body to allow the organism to respond to changes in internal and external environment Parts of a general neurone - Answer Cell body, Dendron, axon, Role of the cell body - Answer To produce neurotransmitters Structure of cell body - Answer Nucleus, cytoplasm, lots of endoplasmic reticulum, mitochondria Function of dendrons - Answer To transmit electrical impulses towards the cell body Function o...

AQA GCSE Biology Topic 5 Homeostatis Homeostasis The maintenance of a constant internal state in a changing environment Why is homeostasis important? Homeostasis is important because it is essential for the survival of cells and enzymes Automatic control systems are made up of Receptors, coordination centres, effectors negative feedback a mechanism of response in which a stimulus initiates reactions that reduce the stimulus Receptor Detects change Coordination centre Receives an...

AQA GCSE Biology topic 5 - Homeostasis and Response Homeostasis maintaining a stable environment e.g. nervous and hormonal communications, body temp, blood glucose levels. negative feedback A process that counteracts a change - increasing and decreasing levels to maintain homeostasis, e.g. sweating to lower the body temp the nervous system A system that manages the body through negative feedback, hormones and effectors made up of Central nervous system (CNS - brain + spinal cord), se...

homeostasis A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level nervous system A conglomeration of billions of cells specifically designed to provide a communication network within the human body. receptors Special structures that allow living organisms to sense the conditions of their internal or external environment stimuli Changes, occurring within or outside the body, that affect...

Auxin is a plant hormone produced in the shoot tip. Auxin causes cell elongation and travels down the stem from the tip. Auxin is destroyed by sunlight. Explain how this leads to positive phototropism in the plant. Correct Answer Auxin is broken down on the sunny side of the plant. Cells on the shaded side will elongate due to auxin, causing curvature of the stem so that the plant grows towards the light. Ivy plants often use walls or other plants as a support when growing. State the type of ...

What is a kinetic response? Non directional random movement in response to a stimulus What is a positive and negative taxis? Positive taxis- organism moves towards stimulus Negative taxis - organism moves away from stimulus What Are receptors? Detect stimuli- can be cells or proteins on cell surface membrane , loads of different types What are effectors? Cells that bring about a response to a stimulus to provide an effect ( muscle cells, glands) Receptors communicate with effectors via...

B5 AQA GCSE Biology Homeostasis and Response (Triology) Graded A What is homeostatis? ️The regulation of the conditions in our body maintaining stable internal environment What does homeostasis do? ️Responds to any change in internal or external conditions. What is a stimulus? ️A change in your environment than requires a response Give some examples of stimuli? ️Light, sound, touch, pressure, pain, chemical or temperature. What do the receptors do? ️Detect the stimulus or c...

Outline how a negative feedback mechanism works (4) Oct/Nov 2017 V1 - 1 change in factor away from, the norm / set-point 2 detected / sensed by, receptor 3 hormone released or (nerve) impulse sent 4 (hormone / impulse) reaches, target organ / effector ; 5 (effector) performs corrective action- counteracts change 6 (factor) returns to, norm / set-poin Describe the role of the nervous system in the control of blood glucose concentration (4) Oct/Nov 2017 V1 - 1 hypothalamus detects cha...

AQA GCSE Biology Paper 2 Final Exam Prep Questions 2024. What is homeostasis? - CORRECT ANSWER The maintenance of a constant internal environment. What is a stimulus? - CORRECT ANSWER A change in your environment than requires a response. e.g Light, sound, touch, pressure, pain, chemical or temperature. What do the receptors do? - CORRECT ANSWER Detect the stimulus or change in environment. What happens after the receptors? - CORRECT ANSWER Receptors send messages to the CNS via the se...