Which type of sensory receptor is activated by chemical stimuli such as taste and smell?

A. It is present at birth and provides immediate defense: This describes innate immunity, which is nonspecific and provides immediate protection against pathogens without prior exposure.

B. It involves skin and mucous membranes as barriers: Physical barriers such as skin and mucous membranes are part of innate immunity and do not confer the specificity associated with adaptive immune responses.

C. It does not involve antibodies: Specific immunity relies heavily on antibodies produced by B lymphocytes to recognize and neutralize specific pathogens. The absence of antibodies would indicate nonspecific defense.

D. It can remember previous encounters with pathogens: Specific (adaptive) immunity has memory, allowing the immune system to respond more rapidly and effectively upon subsequent exposure to the same pathogen. Memory cells, including B and T lymphocytes, are responsible for this enhanced response.

A. Providing structure and support: Connective tissue provides structural framework for the body, supports organs, binds tissues together, and stores energy in the form of fat. It also contributes to tissue repair and protection through its various types, such as bone, cartilage, and ligaments.

B. Covering and lining surfaces: Covering and lining surfaces is the function of epithelial tissue, which forms protective barriers and regulates substance exchange between the body and the environment.

C. Contracting to produce movement: Muscle tissue is responsible for contraction and movement of body parts, including voluntary and involuntary motion, rather than providing structural support.

D. Generating electrical impulses: Nervous tissue generates and transmits electrical impulses to coordinate body functions, but it does not provide the physical support and structural framework that connective tissue does.