Active transport moves molecules against the concentration gradient.

Which structure contains digestive enzymes?

All living organisms are made of one or more cells.

Vasoconstriction of dermal blood vessels results in _____ of heat.

Which of the following store lipids?

If a person is experiencing vasoconstriction of the dermal blood vessels, their skin will look more _____ than usual.

Which is involuntary?

Which appear striated (banded) under a microscope?

In response to cold temperatures outside, dermal blood vessels _____.

Acne is due to ducts being plugged with sebum, which is produced by which type of skin gland(s)?