The majority of connective tissues contain
A. a large number of cells with a small amount of liquid matrix.
B. an even distribution of cells and extracellular matrix.
C. a large amount of extracellular matrix and a few scattered cells.
D. large numbers of cells and very little extracellular matrix.
E. a dense collection of protein fibers with no extracellular matrix.
Answer: C
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When heart rate increases, the time spent in
A) systole increases. B) diastole increases. C) all phases decreases but most of the decrease is during systole. D) all phases decreases but most of the decrease is during diastole. E) isovolumetric contraction increases.
Calcium turns on cross bridges by physically repositioning the troponin-tropomyosin complex to uncover the actin cross-bridge binding sites in
a. skeletal muscle. b. cardiac muscle. c. smooth muscle. d. both skeletal and cardiac muscle. e. all of these answers.
Plasma proteins essential in body defense are the
A) albumins. B) fibrinogens. C) immunoglobulins. D) platelets. E) transport proteins.
Which of the following statements is true regarding tonsils?
a. Tonsils provide protection against bacteria entering the oral and nasal cavities. b. Tonsils contain red pulp and white pulp. c. Tonsils increase in size in adults. d. Tonsils are located in both the oral and abdominal cavities. e. Tonsils are not functional in children.