Human Coordination Systems

Question 1

What do organisms respond to in an environment

Answer 1

WHOT LSP

Water, heat, odour, temperature, sound, pressure

Question 2

What allows species to thrive

Answer 2

Adaptability - respond to changes internally and externally - increases chance of survival - better chance of reproducing

Question 3

What is homeostasis

Answer 3

the ability for organisms to keep a stable internal state and temperature in the body. It allows the body to keep glucose, oxygen, carbon dioxide, blood pH, water and temperature at a set point between limits, which is maintained despite the external environment.

Question 4

Why is homeostasis important

Answer 4

Keeps the body’s systems in working order, for example the nutrient, oxygen and carbon dioxide levels, pH levels, water, waste, temperature, volume and pressure levels. Changes affect enzyme reactions, which can lead to a decrease in enzyme activity.

Question 5

How do humans detect changes from the stable state

Answer 5

Internal and external stimuli reveal changes. External stimuli - physical factors: light, or chemical factors such as oxygen levels. Internal stimuli include core body temperature or carbon dioxide levels in the blood. Stimuli are picked up by receptors. External receptors: eyes, ears, tongue, nose and skin. Internal receptors include nerve cells.

Question 6

How does homeostasis work?

Answer 6

Homeostatic regulation -
nervous and endocrine systems: keep the body’s systems functioning at optimal levels.
The nervous system triggers rapid responses from the body
Endocrine system uses hormones to maintain tissues and organs.
Link: hypothalamus.
Negative feedback is when the body senses change from the set point and activate a process to negate change. e.g. body temperature goes too high, negative feedback will work to bring your temperature back down.