Reflex arc & Neurons & nervous conditions
- Created by: fahmida1998
- Created on: 05-10-16 16:43
View mindmap
- Reflex arc & Neurons &nervous conditions
- Principals of coordination
- Nervous system
- use nerve cells to pass electrical impulses
- stimulate target cells by secreting NEUROTRAN-SMITTERS on them
- = rapid communication between specific part of organism
- response- short lived & restricted to a localised region on body
- e.g reflex arc
- Importance
- 1.involuntary-brain can carry out + complex responses
- some impulses still sent to brain - to inform-> override the reflex if necessary
- 2.protect body from harm
- 3.fast-neuron pathway short d.t few synapse
- 4.rapid d.t absence of decision making
- 1.involuntary-brain can carry out + complex responses
- Importance
- effect- usually temporary & reversible
- Hormonal sytem
- hormones transported to blood plasma to their target cells
- target cells have specific receptors. change in hormone concentration = stimulation
- = slower, less specific form of communication between parts of organism
- target cells have specific receptors. change in hormone concentration = stimulation
- long-lasting response & widespread
- e.g control of blood glucose conc
- effect- permanent & irreversible
- hormones transported to blood plasma to their target cells
- Nervous system
- 3 neurons
- Relay/Intermediate
- transmit impulses between neurons
- lots of short processes
- Motor
- transmit impulses from rely to effector
- long axons and + short dentries
- Sensory
- transmit nerve cells from receptor to relay or motor
- 1 dendron (v.long) - carries impulse to cell body
- 1 axon - carry impulse away from cell body
- Relay/Intermediate
- Sequence
- Stimulus
- Receptor
- Sensory n
- Relay n
- Motor n
- Effector
- Response
- Effector
- Motor n
- Relay n
- Sensory n
- Receptor
- Stimulus
- Nervous organisation
- Peripheral Nervous System - (made up of pairs of nerves from brain or spinal cord)
- Sensory n system (receptor to CNS)
- Motor n system (CNS to effector)
- Automatic nervous system (carry nerve impulses to glands, smooth muscles & cardiac muscles)- SUBCONSCIOUS
- Voluntary nervous system (carry nerve impulses to body muscles)- CONSCIOUS
- CNS
- Brain
- Spinal chord
- Peripheral Nervous System - (made up of pairs of nerves from brain or spinal cord)
- Principals of coordination
Comments
No comments have yet been made