AT2 Flashcards
(26 cards)
What is homeostasis?
The maintenance of an interna temperature
Why is it important to keep the body at 37 degrees?
It allows chemical reactions to occur at the optimum rate
How does the body maintain pH?
By exhaling CO2 through breathing, which removes excess acid and keeps blood balanced
What are examples of thermoregulation?
Shivering, sweating, vasodilation and vasoconstriction.
what is a stimulus?
A change in body temp(either too hot or cold)
What is a receptor?
Located in the skin and brain, sending signals to regulate body temp
What is a control centre?
Hypothalamus, receives signals and coordinates responses
What is an effector?
Includes sweat glands and muscles they respond to restore temperature
What is a response?
Responds by sweating or shivering to restore temp
How does the nervous system send signals?
Via electromagnetic impulses
What do glands do in the body?
Produce hormones e.g the pancreas gland
How does the endocrine system send signals?
Releases hormones into the blood to signal and control body systems
How do hormones deliver longer taking messages but last longer?
Hormones are released into the blood and bind to target cells, this causes lasting effects because they stay in the bloodstream longer.
CNS
Consists of brain and spinal cord, processes and coordinates info
PNS
Sensory neurons that detect stimuli, motor neurons that control muscles
How does the nervous system respond to pain
Pain signals travel through to the spinal cords, quickly triggering muscles to move away
How does the pancreas lower blood sugar?
Insulin lowers blood sugar after eating, glucagon raises it during fasting
Different energy sources
-Biogas
-Biomass
-Coal
-Crude oil
-Gas
-Nuclear
-Solar
-Wind
-Hydroelectric
What is charge?
The number of electrons in an area, measured in coulombs (C)
What is current?
Flow of charge, measured in Amps
What is voltage?
The energy per electron, measured in voltage (V)
What is resistance?
Opposition to the flow of charge, measured in Ohms
What are the required components for a working circuit?
Voltage source, load, closed circuit
How do solar panels work?
When sunlight hits the panels it excited electrons , creating electricity
