Stimuli and Responses Flashcards
1
Q
A
- baroreceptors detect inc in blood pressure
- impulses send to medulla
- impulses sent to SAN
- along parasympathetic nervous system
2
Q
A
- less malonyl coA
- more fatty acids move into mitochondrion
- more ATP made in aerobic respiration
3
Q
A
- more slow twitch fibres
OR
- inc in aerobic resp
4
Q
A
- more ATP produced in aerobic respiration
- anaerobic respiration delayed
- less lactate
5
Q
A
- adult mice have wider range of muscle fibre diameter than young mice
- young fibres range 32/33/34 and adult fibres range 68/69/70/71
6
Q
diabetes can damage the nervous system.
the response of rats with diabetes is different from the response of healthy rats.
use your knowledge of the control of heart rate by the nervous system to suggest an explanation for this?
A
- damage to autonomic nervous system in diabetic rats
- baroreceptors in arteries dont work as well
- damage to medulla
- when pressure drops - damage to sympathetic nervous system - doesnt speed up enough
7
Q
the heart controls and coordinates the regular contraction of the atria and ventricles
how?
A
- SAN -> AVN -> bundle of His -> purkinje fibres
- impulses sent across atria
- atria contract
- non-conducting tissue between atria and ventricles
- delay at AVN to allow atria empty and ventricles fill up before contract
- ventricles contract from apex up
8
Q
when heart beats, both ventricles contract at the same time
explain how this is coordinated in the heart after intiation of heartbeat by SAN
A
- electrical activity only through bundle of His
- wave of electrical activity passes throug both ventricles at same time
9
Q
APP Q
after reading the scientists’ report, a member of a swimming club stated that the report shows that swimming flat out is better for you than swimming for a length of time.
EVALUATE this statement
A
- swimming flat out not tested to see if beneficial for body
- dont know sample size - may not = representative
- flat out = subjective (based on opinion)
- swimming ability may vary among swimmers
- assumes inc in heart rate beneficial no matter what
- long term effects unknown
