16 flashcards · Shared on 19 August 2026 by AtomAI Library
Flip each card to check yourself.
A rise in blood glucose triggers insulin release, and insulin then lowers blood glucose. Why is this negative feedback?
The response opposes the original change in blood glucose
A rise in blood glucose triggers insulin release, and insulin then lowers blood glucose. Why is this negative feedback?
The response opposes the original change in blood glucose
What is the effect of increased antidiuretic hormone, or ADH, on the kidneys?
More water is reabsorbed, producing a smaller volume of concentrated urine
What is the main effect of negative feedback?
It reverses a deviation and moves a variable back toward its normal range
Which combination helps conserve and generate heat when body temperature falls?
Shivering and constriction of skin blood vessels
Which response helps lower body temperature when a person becomes too hot?
Sweating and dilation of skin blood vessels
In homeostasis, what is a regulated variable?
A condition that is monitored and controlled, such as body temperature
Which sequence correctly describes a basic homeostatic control system?
Stimulus → receptor → coordination centre → effector
Why does homeostasis not usually keep internal conditions at one exact value?
Internal conditions normally fluctuate within a narrow acceptable range
What usually happens when blood glucose concentration rises after a meal?
The pancreas releases insulin, promoting glucose uptake and storage
What is the role of a receptor in a negative feedback system?
To detect a change in a regulated condition
What does an effector do in a homeostatic system?
It carries out a response that changes the regulated condition
Which part of the brain acts as a coordination centre for body temperature regulation?
Hypothalamus
How does positive feedback differ from negative feedback?
Positive feedback amplifies a change, while negative feedback opposes it
How does sweating help cool the body?
Sweat absorbs heat as it evaporates from the skin
What is homeostasis?
The maintenance of a relatively stable internal environment despite changes
How does glucagon help restore blood glucose when it falls too low?
It causes the liver to release more glucose into the blood