Homeostasis

Question 1

What is homeostasis?

Answer 1

The body’s attempt to adjust to a fluctuating external environment

Question 2

Homeostasis is also maintaining an _________ balance.

Answer 2

Internal

Question 3

Examples of homeostasis.

Answer 3

kidneys maintain water balance
- evaporation of water helps regulate body temperature
- hypothalamus regulates temperature and changes in
osmotic pressure
- pancreas regulates blood sugar
- skeletal muscles contract and release heat
- blood distributes heat throughout the body

Question 4

Why does homeostasis refer to the body’s attempt to adjust to a fluctuating external environment?

Answer 4

In order to maintain a constant
balance or steady state.

Question 5

Homeostasis is also referred as..

Answer 5

DYNAMIC EQUILIBRIUM

Question 6

Three parts of feedback system?

Answer 6

1. Sensor
2. Integrator
3. Effector (regulator)

Question 7

What is sensor in feedback system?

Answer 7

sensors located throughout the body that identify changes and sends a signal to the coordinating center (Integrator)

Question 8

What is integrator in feedback system?

Answer 8

relays the information to the appropriate regulator

Question 9

Example of integrator in feedback system.

Answer 9

Hypothalamus

Question 10

What is regulator in feedback system?

Answer 10

Takes action to restore the normal balance

Question 11

Examples of regulator in feedback system.

Answer 11

Skin blood vessels, skeletal muscles, sweat glands

Question 12

What are the two types of feedbacks?

Answer 12

Positive and negative

Question 13

What is negative feedback?

Answer 13

A process by which a mechanism is activated to restore conditions to their original state.

Question 14

What is negative feedback designed to do?

Answer 14

Resist change.

Question 15

What systems, does Body temperature feedback loop involve?

Answer 15

It involves the
integumentary system (skin), the nervous system, and the endocrine system

Question 16

What is positive feedback?

Answer 16

In response to a perturbation, it acts to increase the intensity of the perturbation.

Process by which a small effect is amplified

Question 17

What does positive feedback reinforce?

Answer 17

change and less common in the body.

Question 18

An example of positive feedback (1)?

Answer 18

A person gets cut, chemicals are
released to activate the platelets.

Question 19

In positive feedback, what happens after a person gets cut and the chemicals are released to activate the platelets?

Answer 19

The activated platelets then release more chemicals to stimulate more platelets until the bleeding is stopped.

Question 20

Another example of positive feedback (2) ?

Answer 20

Regulating contractions during childbirth

Question 21

Positive feedback only works in systems that have a…..

Answer 21

definite endpoint.

Question 22

What is an example of definite endpoint?

Answer 22

Like the bleeding stops or the baby is
born.

Question 23

What is
thermoregulation?

Answer 23

Maintenance of body temperature within a range that enables cells to function efficiently

Question 24

What are ectotherms?

Answer 24

Cold blooded. When they must thermoregulate through
behaviour changes

Question 25

In ectotherms, body temperature depends on what?

Answer 25

the environment

Question 26

What are endotherms? Examples?

Answer 26

Warm blooded. Having internal mechanisms to control body temperatures

Speeding up cellular respiration

Question 27

What are some examples that are animal, that are ectotherms.

Answer 27

Fishes, reptiles

Question 28

What are some examples that are animal, that are endotherms

Answer 28

mammals, birds

Question 29

What is hypothalamus?

Answer 29

The control centre for thermoregulation

Question 30

What part of our body is hypothalamus?

Answer 30

It is the part of the brain responsible for coordinating many nerve and hormone functions

Question 31

check slide 5, 6, 8, 10, 11, 12 for diagrams.

Answer 31

period