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Epithelium is the covering, lining and glandular tissue whose functions include protection, absorption, and secretion. Epithelia are named according to cell shape and cell arrangement Connective tissue is the supportive, protective and binding tissue characterized by the presence of an extracellular matrix produced and secreted by the cells. Fat, ligaments, tendon, bones and cartilage are all connective tissues. Muscle tissue is specialized to contract or shorten to produce movement. There are three types of muscle tissue, known as skeletal muscle, cardiac muscle, and smooth muscle. Nervous tissue is made of cells called neurons that receive and transmit nerve impulses throughout the body.
Review questions Question 1 Which organelle is considered to be the control center of the cell? A. B. C. D.
The endoplasmic reticulum. The nucleus. The mitochondria The golgi apparatus
The answer is B, the nucleus. Question 2 Which of the following is not a function of DNA? A. B. C. D.
Provides a blueprint of instructions for the body. Provides a site for protein synthesis. Responsible for the building of proteins. Key role player in cell reproduction.
The answer is B, DNA does not provide a site for protein synthesis.
Question 3 When the cell is not dividing, DNA combines with protein to form a loose network of threads called the… A. B. C. D.
Chromatin Nucleoli Spindle fibers Chromosomes
The answer is A, DNA combines with protein to form chromatin. 20
