The immune system is the body's defense against disease. white blood cells, or lymphocytes, are one type of immune system cell. which of the following immune system cells make markers that tag invading pathogens for later destruction?
a. t cells
b. cytotoxic t cells
c. macrophages
d. b cells

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

Which blood cell spend most of their time in the lymphatic system?