Homeostasis Test 9/26

What is the normal body temp

98.6

What is the normal range for sugar (glucose) levels

80-100 mg

Fishbowl Model

We are a big walking fishbowl and our cells are the fish

Why is the fishbowl model accurate?

If the outside of the glass gets to hot, you have to take certain measures to make sure the water gets too hot and the fish die

Wallenda Model

Acrobat maintaining balance on a high wire

Feedback Control Loop Steps

1. Sensor Mechanism

2. Integrator or Control Center (brain)

3. Effector Mechanism (sweat)

4. Feedback

sensor

must be able to identify the characteristic or condition being controlled

integrator

senses an imbalance and sends signal to effector

Effector

organs that directly influence controlled physiological variables

Hypothalamus

thermostat in the brain

Negative feedback

oppose or negate a change by creating a response opposite in the direction to the initial disturbance

what type of feedback is this: Body temp goes up, response is to make body temp go back down

Negative feedback

what type of feedback is this: blood clotting

Negative feedback

Positive Feedback

Tends to amplify or reinforce the change that is occurring. is often harmful, even disastrous to survival. moves in the same direction to the disturbance

what type of feedback is this: childbirth

positive feedback

what type of feedback is this: vomiting

positive feedback

An example of a daily cycle is..?

sleep patterns

Response Pathway

begins with a stimulus or trigger, and ends with a response

What is the stimulus-Response phenomenon’s main three components?

sensor, integrator, effector

Direction of signals: Afferent

signal that travels towards the brain and integrating center or point of reference, signal coming into the brain

Direction of signals: Efferent

signal that moves away from an integrating center or other reference point. signal coming from the brain