L3 HOMEOSTASIS and CONTROL and CONTROL SYSTEM Flashcards
What is HOMEOSTASIS?
The maintenance of constant INTERNAL environment
What is negative feedback? describe the process
Brings levels back to normal, eg if levels go too high it decreases it
If too low it increases it.
- Change
- Sensor detects change
- Signals are sent to INTEGRATING SYSTEM
- INTEGRATING SYSTEM transmits impulse to effector
- effector bring change
What are normally the effector cells in the BODY?
Muscle cells, secretory cells
What are the two main integrating system?
CNS, endocrine system
What is afferent pathway?
its the INCOMING pathway, incoming signals
What is efferent pathway?
OUTGOING signals pathway to effector
How is FALL in blood pressure regulated? (Haemorrhage)
- Fall in blood, receptor detected by sensory STRETCH BARORECEPTOR located in the CAROTID ARTERIES
- propel signal through gloss-pharyngeal nerve to
- MEDULLA OBLONGATA
- Which sends impulses to ANS in sympathetic branch
- Heart rate is increased which increases BP
What is POSITIVE FEEDBACK?
its when initial change is change even further instead of being brought back to normal in the case of negative feedback
Give 3 example of positive factor.
- Formation of blood clot
- ovulation
- Action potential
Which integrating system has LONG TERM EFFECTS?
endocrine system
Which integrating system has SHORT term effects?
nervous system
what nerves control the CONSCIOUS skeletal system?
SOMATIC nerves
What system is the unconscious system?
Autonomic nervous system
Where do preganglionic nerves of the SYMPATHETIC nervous system originate?
- Thoracic and Lumbar part of the spine (middle)
Where do preganglionic nerves of the PARASYMPATHETIC system originate from?
Sacral and Cranial part of the spine (top and bottom)
