Endocrine cells
a) release their secretions onto an epithelial surface.
b) are a type of nerve cell.
c) release their secretions directly into body fluids.
d) are modified connective-tissue cells.
e) contain few vesicles.

The coreect answer is C)  release their secretions directly into body fluids.

Explanation:

Endocrine cells are found in endocrine glands which are also called ductless glands and release their secretions directly into the body fluids. The secretions are mainly hormones and they reach their target organs through blood.

The major endocrine glands are pituitary, thyroid, parathyroid, pancreas, adrenal, ovaries and testicles. Hormones released by these glands regulate the functional activity of their target cells and organs.

Some of the glands like hypothalamus and thymus contain cells which secrete hormones also comes under endocrine system but are not called endocrine gland.

answer:

i believe the answer is d).

explanation:

i think this is because you are tearing apart the muscle, and then when you eat, the muscle re-heals, making itself even stronger.

edit: i put b) before but i meant to put d). sorry for the incorrect answer.