Homeostatis And Response 2 Flashcards

1
Q

What is homeostatis

A

Regulation of internal conditions in a cell or organism in response to internal and external changes to maintain optimum conditions for function

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2
Q

Sequence for nervous system response

A

Stimulus
Receptor
Sensory neuron
Central nervous system (CNS)
Motor neuron
Effector
Response

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3
Q

Sequences for nervous system but for reflex pathway

A

Stimulus
Receptor
Sensory neuron
Relay neuron
Motor neuron
Effector
Response

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4
Q

Which stage is different in the sequence for normal nervous system response to reflex pathway

A

Normal nervous system response= CNS (brain processes information)
Reflex pathway= relay neuron in spinal cord

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5
Q

2 Examples of effectors

A

Glands (release hormones)
Muscles (contract)

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6
Q

What is a synapse

A

Gap between 2 neurons

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7
Q

Which muscles are on inside out of circular and radial muscles

A

Circular are on inside

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8
Q

Which metabolic process produces water

A

Respiration (water vapour)

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9
Q

3 parts of control system (includes both nervous responses and chemical responses)

A

Receptor
Coordination centre
Effector

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10
Q

What is Thermoregulation

A

Control of internal body temperature

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11
Q

Where are most receptors found

A

Sense organs

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12
Q

3 things controlled in homeostatis

A

Blood glucose concentration
Water levels
Body temperature

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13
Q

The automatic control systems of homeostasis involve what or what (they all have receptors, coordination centre and effectors)

A

Nervous responses or chemical responses

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14
Q

When someone is short sighted, where does light focus for distant objects

A

In front of the retina

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15
Q

When someone is long sighted where does light focus for nearby objects

A

Behind the retina

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16
Q

Lens used to correct myopia (short sightedness)

A

Concave

17
Q

Lens used to correct hyperopia

A

Convex

18
Q

What is myopia

A

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)

19
Q

What is hyperopia

A

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)

20
Q

What is accommodation

A

Process of changing shape of lens to focus on near/distant objects

21
Q

How eye focuses on nearby object

A

Suspensory ligaments slacken
Ciliary muscles contract
Lens is fatter so refracts light more strongly

22
Q

How eye focuses on distant object

A

Suspensory ligaments tighten
Ciliary muscles relax
Lens becomes thinner
Light refracted less strongly