Homeostasis 1 Flashcards Preview

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Flashcards in Homeostasis 1 Deck (15)
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1
Q

Cells are ____ and ____ organised into tissue and organ systems.

A

Structurally, functionally.

2
Q

Define tissue.

A

Groups of cells that share the same characterisations (e.g muscles).

3
Q

Define organs.

A

Collections of tissues, usually of several different types, that synchronise to perform a particular function.

4
Q

What is the equation of life?

A

Nutrients + Oxygen —> ATP + CO2 + Wastes

5
Q

What is homeostasis?

A

When one thing increases, another must increase/decrease to meet the demand and prevent disturbance in the system.

6
Q

Define physiology.

A

The study of how the body should work and what happens when things go wrong.

7
Q

Define negative feedback.

A

When an original trigger starts a response and the aim is to turn off the original trigger. Important for homeostasis.

8
Q

Name 3 challenges to our internal environment.

A

External temperature, diet, exercise.

9
Q

How can temperature be controlled?

A

Vasodilation/Vasoconstriction, sweating.

10
Q

At extremes, homeostasis becomes more/less effective.

A

Less

11
Q

Where are integrating systems often found?

A

The brain.

12
Q

Describe the process of negative feedback?

A

Change in controlled variable -> Stimulus -> Receptor -> Integrating Centre -> Effector -> Response

13
Q

Define a feed forward system.

A

More sophisticated than negative feedback as it can predict and prevent changes.

14
Q

Define positive feedback.

A

When an initial disturbance sets off events that lead to an even greater disturbance. Common in pathophysiology.

15
Q

Define a nerve action potential.

A

Depolarisation creates an instability in the membrane, increases sodium permeability, allows more sodium cells to go into the cell. Makes membrane more unstable, increases depolarisation and continues.