Homeostasis is best described as:

The maintenance of a stable internal environment

Which list shows the parts of a feedback loop?

Receptor, control center, effector

Cell, tissue, organ, organ system

Transport oxygen, nutrients, and wastes around the body

Diffusion down its concentration gradient

A large surface area and thin wall

The nervous system sends fast electrical signals; the endocrine system sends slower hormonal signals

Barriers such as skin, mucus, and stomach acid

Recognize a specific pathogen's antigen and help destroy it

It contains a weakened, dead, or partial pathogen that triggers antibodies and memory cells

Memory cells recognize the pathogen and produce antibodies quickly

14questions. Pick an answer and you'll see why right away.

Homeostasis is best described as:
When body temperature rises, the body sweats to cool down. This is an example of:
Which list shows the parts of a feedback loop?
Which list shows the levels of organization from smallest to largest?
The main function of the circulatory system is to:
In the lungs, oxygen moves from the alveoli into the blood by:
Which feature of the alveoli helps make gas exchange fast?
Which statement best compares the nervous and endocrine systems?
Which gland releases insulin to lower blood glucose?
A disease-causing microorganism, such as a bacterium or virus, is called a:
Which is the body's first line of defense against pathogens?
Antibodies are proteins that:
How does a vaccine produce immunity without causing the disease?
Why does a vaccinated person respond faster if they later meet the real pathogen?