Stem cells of connective tissue which repair damaged tissues by replacing cells are called _______.

connective tissue with a hard yet flexible matrix composed of calcium salts and collagen fibers; cells arranged in concentric circles

As we age, it takes longer for cuts to heal.  Older people are often cold.  These observations can be explained by the fact that as we age, the effectiveness of homeostatic control mechanisms ________.

means mature; maintains the matrix

A system of interconnected channels called cisternae wrapped in a membrane

The powerhouse, responsible for cellular respiration, makes energy is the 

What are the wavelike projections of the papillary layer that contain capillary loops, free nerve endings, etc?

glands that release their secretions by pinching off part of their cells which become the secretion (armpit sweat glands, mammary glands, wax glands)

Large organic molecules are called ________________.

A distinct structure composed of several types of tissues is a(n)