BTEC Applied Science Unit 9B: Homeostatic control of body
systems and nervous system |100% verified
why and with what is blood sugar level regulated?
to provide cells with a constant supply of glucose for respiration. Controlled by the release
and storage of glucose, wich is in turn controlled by insulin
Why do we need to keep our internal environment stable?
1. all function of a cell are enzyme controlled
2. enzymes work best at their optimum temp and pH
What makes us sensitive to things?
receptors
What is sensitivity?
the ability to detect and respond to stimuli. Its one of the characteristics of living things (Mrs
Gren)
What is a stimulus?
a change in the environment and its detected by a specific receptor
what are receptor cells?
Specialised cells that detect a stimulus
what are example of receptor cell groups?
skin - touch, pressure, pain, temp
eyes - light, changes in light, colour
nose - chemicals in the air, smell
mouth - chemical in food, taste
ears - changes in sound, balance
what are the specific receptor cells for each group?
, eyes: photoreceptors - rods and cones
nose: chemical receptors in nasal passage
skin: temp and pressure
ear: sound and vibrations
tongue: chemical receptors in taste buds
how does the right response happen at the right time?
receptors send electrical impulses to coordination centres in the body which include the
brain and spinal cord (CNS)
what are effectors?
muscles or glands in the body that produce a response to restore optimum levels in the
body
what are some examples of effectors?
- a muslce contracting to lift a leg
- a gland releasing a hormone into the blood
require practical - Investigating the effect of a factor on human reaction time: what is the
equipment needed?
metre ruler, chair or stool, partner
require practical - Investigating the effect of a factor on human reaction time: what are
some safety notes:
try not to hit yourself or your partner with the falling ruler
require practical - Investigating the effect of a factor on human reaction time: what's the
method?
1. write a hypothesis
2. use non-dominant hand
3. sit on a chair or stool and place your non-dom hand in front of you
4. your partner will drop the ruler without telling you when
5. catch the ruler as quick as you can
systems and nervous system |100% verified
why and with what is blood sugar level regulated?
to provide cells with a constant supply of glucose for respiration. Controlled by the release
and storage of glucose, wich is in turn controlled by insulin
Why do we need to keep our internal environment stable?
1. all function of a cell are enzyme controlled
2. enzymes work best at their optimum temp and pH
What makes us sensitive to things?
receptors
What is sensitivity?
the ability to detect and respond to stimuli. Its one of the characteristics of living things (Mrs
Gren)
What is a stimulus?
a change in the environment and its detected by a specific receptor
what are receptor cells?
Specialised cells that detect a stimulus
what are example of receptor cell groups?
skin - touch, pressure, pain, temp
eyes - light, changes in light, colour
nose - chemicals in the air, smell
mouth - chemical in food, taste
ears - changes in sound, balance
what are the specific receptor cells for each group?
, eyes: photoreceptors - rods and cones
nose: chemical receptors in nasal passage
skin: temp and pressure
ear: sound and vibrations
tongue: chemical receptors in taste buds
how does the right response happen at the right time?
receptors send electrical impulses to coordination centres in the body which include the
brain and spinal cord (CNS)
what are effectors?
muscles or glands in the body that produce a response to restore optimum levels in the
body
what are some examples of effectors?
- a muslce contracting to lift a leg
- a gland releasing a hormone into the blood
require practical - Investigating the effect of a factor on human reaction time: what is the
equipment needed?
metre ruler, chair or stool, partner
require practical - Investigating the effect of a factor on human reaction time: what are
some safety notes:
try not to hit yourself or your partner with the falling ruler
require practical - Investigating the effect of a factor on human reaction time: what's the
method?
1. write a hypothesis
2. use non-dominant hand
3. sit on a chair or stool and place your non-dom hand in front of you
4. your partner will drop the ruler without telling you when
5. catch the ruler as quick as you can
