In smooth muscle, where does the calcium needed for contraction come from?
A. Mitochondria
B. The motor nerve fiber
C. The sarcoplasmic reticulum
D. The extracellular fluid
E. Intercalated discs
Answer: D
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Which is not correct about fertilization?
A. It determines the sex of the organism. B. It restores the diploid number of chromosomes. C. It initiates cleavage. D. It establishes the three primary germ layers. E. It combines male and female genetic material.
Blood type is an example of a trait that demonstrates
A. strict Mendelian inheritance. B. codominant inheritance. C. incomplete dominance. D. polygenic dominance. E. sex-linked recessiveness.
On the scapula, the acromion is continuous with the ________.
Fill in the blank(s) with the appropriate word(s).
The functions of the lymphatic system do not include
A) returning interstitial fluid to the bloodstream. B) protecting the body against infection. C) transporting the products of lipid digestion from the intestine to the liver. D) transporting hormones to intestinal smooth muscle.