Which of the following central nervous system cells regulate ions, regulate the uptake and/or breakdown of some neurotransmitters, and contribute to the formation of the blood-brain barrier? a. microglia b. neuroglia c. oligodendrocytes d. astrocytes

When a mast cell reacts to an irritation, which of the following chemicals does it release? a. collagen b. histamine c. hyaluronic acid d. meylin

Ligaments connect bones together and withstand a lot of stress. What type of connective tissue should you expect ligaments to contain? a. areolar tissue b. adipose tissue c. dense regular connective tissue d. dense irregular connective tissue

Under the microscope, a tissue specimen shows cells located in spaces scattered in a transparent background. This is probably ________. a. loose connective tissue b. a tendon c. bone d. hyaline cartilage

The ________ exocrine gland stores its secretion until the glandular cell ruptures, whereas the ________ gland releases its apical region and reforms. a. holocrine; apocrine b. eccrine; endocrine c. apocrine; holocrine d. eccrine; apocrine

In bone, the main cells are ________. a. fibroblasts b. chondrocytes c. lymphocytes d. osteocytes