Y13 Homeostasis Long Processes Flashcards
1
Q
How is heart rate regulated?
A
- cardiovascular centre in medulla oblongata is the processor for nervous control in the heart
- if a drop in blood pH is detected this indicates increase in CO2 concentration
- more action Potentials are sent to the natural pacemaker called the sinoatrial nerve along the sympathetic nerve
2
Q
Homeostasis relies on three things:
A
- negative feedback systems
- detected by receptors
- change back to normal carried out by effectors
3
Q
How does body respond to a decrease in temperature
A
- body temp monitored by hypothalamus and peripheral temp receptors in the skin
- if the core body temp drops he brain sends signals to the effectors to reverse the change by conserving heat
- blood vessels near skin contract, muscle contractions occur causing shivering and hair near the skin to be raised
