★ Human Body Quiz
During cold weather or when frightened, hair on our skin stand. why?
A. pilimotor muscles contract and pull the base of the hairs
B. skin contracts
C. hairs becomes hard and appears standing
D. the cold weather makes the hairs elongate and stand
Select your answer:
Topics:
Cancer & Cell Cycle Safety and First Aid Blood & Blood Vessels Special Senses Immunology Pancreas The Nervous System Circulatory System and Nutrition Chronic Diseases World Health Day The Vascular System and Blood Flow Functional Anatomy in Track & Field Muscle Tissues Muscular System Movements Excretion-DialysisOther quiz:
Germs › ViewTrue or False: A germ can enter the body through the skin?
A. TRUE
B. FALSE
Microbiology › View
Superantigens are
A. cell markers found in some member of a species but not in other members.
B. antigens that evoke allergic reactions.
C. bacterial toxins that activate T cells at a 100 times greater rate than other antigens.
D. body tissues that the immune system mistakes as foreign.