Homeostatis And Response 2 Flashcards
What is homeostatis
Regulation of internal conditions in a cell or organism in response to internal and external changes to maintain optimum conditions for function
Sequence for nervous system response
Stimulus
Receptor
Sensory neuron
Central nervous system (CNS)
Motor neuron
Effector
Response
Sequences for nervous system but for reflex pathway
Stimulus
Receptor
Sensory neuron
Relay neuron
Motor neuron
Effector
Response
Which stage is different in the sequence for normal nervous system response to reflex pathway
Normal nervous system response= CNS (brain processes information)
Reflex pathway= relay neuron in spinal cord
2 Examples of effectors
Glands (release hormones)
Muscles (contract)
What is a synapse
Gap between 2 neurons
Which muscles are on inside out of circular and radial muscles
Circular are on inside
Which metabolic process produces water
Respiration (water vapour)
3 parts of control system (includes both nervous responses and chemical responses)
Receptor
Coordination centre
Effector
What is Thermoregulation
Control of internal body temperature
Where are most receptors found
Sense organs
3 things controlled in homeostatis
Blood glucose concentration
Water levels
Body temperature
The automatic control systems of homeostasis involve what or what (they all have receptors, coordination centre and effectors)
Nervous responses or chemical responses
When someone is short sighted, where does light focus for distant objects
In front of the retina
When someone is long sighted where does light focus for nearby objects
Behind the retina
Lens used to correct myopia (short sightedness)
Concave
Lens used to correct hyperopia
Convex
What is myopia
Short sightedness where distant objects appear blurry
Treated with concave lens which diverges the parallel light rays so that light focuses on the retina (instead of before it)
What is hyperopia
Long sightedness
Nearby objects look blurry
Treated with convex lens which converges parallel light rays to allow light to focus on the retina (and not behind it)
What is accommodation
Process of changing shape of lens to focus on near/distant objects
How eye focuses on nearby object
Suspensory ligaments slacken
Ciliary muscles contract
Lens is fatter so refracts light more strongly
How eye focuses on distant object
Suspensory ligaments tighten
Ciliary muscles relax
Lens becomes thinner
Light refracted less strongly
