Ch2& 3 Human Body Flashcards
The body is made up mostly (80%!) of one component. What is it?
Water
Why does the body need so much water (at a cellular level)? (4marks)
In order to transplant chemicals and hormones etc around the body
to facilitate chemical reactions within the body
To regulate homeostasis
To support the structure of various organs
What is Homeostasis and what does it comprise of?
Homeostasis is the maintenance of a constant internal environment within the body.
It comprises of a ph level of 7.35, 0.1% blood sugar and 37degrees C temperature
What protection does the skeleton afford the organs of the body?
Cavities provide protection against shocks
Thoraic cavity
Abdominal cavity and pelvic cavity are eggs of a few of these.
More info on p29 of padpilot
At a cellular level, if a cell is deprived of ___________ the cell may cease to function and die, resulting in pilot incapacitation
Oxygen and nutrients
What is the ANS and what is it responsible for?
Autonomic nervous system/ vegetative/ autonomous nervous system.
It is responsible for things that we do not have conscious control over, such as the following bodily functions: sweating, breathing rate and heart rate regulation, temp control, kidneys, homeostasis etc as well as general adaption syndrome (fight or flight response)
What are proprioceptors?
A type of receptor found within the muscles and tendons. They tell us about movement and the body position, velocity of body movement and acceleration within the body.
What is the absolute threshold?
The threshold at which a receptor will act upon a stimulus e.g. When a pupil dilates in response to sunlight, it is due to the stimulus being at this threshold.
The CNS is made up of what?
The brain and spinal chord
What is the CNS responsible for?
Pain and movement.
All senses lend themselves to habituation - true or false?
True!
E.g. If you are blind your other senses become heightened.
Over 70% of our sensory information comes through via what channel?
Visual!
If the sensory threshold is increased, what is the effect on our sensitivity to it?
Our sensitivity to stimuli is decreased
What is JND?
The Just noticeable difference. Increase or decreases in stimuli required before the body is able to detect a change
What is the role of the peripheral nervous system?
to transfer sensory inputs to the CNS via sensory nerves and motor nerves.
