Which statement is true?
1.Both the parasympathetic and sympathetic nervous systems send nerves to all organs.
2.The sympathetic nervous system that supplies an organ will also provide parasympathetic nerves to it.
3.The sympathetic branch can have either excitatory or inhibitory effects depending on effects from the environment.
4.The sympathetic branch of the autonomic system usually speeds up the activities of the body.
5.The parasympathetic system usually speeds up the activities of the body.
4
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It is well established that developmental biology has impacts on public health. For instance, thalidomide, an anticonvulsive and antihistimine medication, was prescribed to reduce nausea or morning sickness in pregnant women. It was subsequently shown to cause severely deformed limbs (hands and feet, but reduced arms and legs) in children whose mothers took the medication. What might thalidomide
do during development? A. Cause a defect in the fertilization of an egg. B. Severely alter blastulation in the embryo. C. Impair morphogenic fields within the embryo. D. Impair neural tube formation. E. Block cell division during blastulation.
A heterozygote has
A) two different alleles for a gene. B) only one allele for a gene. C) an extra genome. D) one copy of each sex chromosome.
Blood usually continues on from capillaries to enter
__________ in its travel through the human body. a. arterioles b. venules c. arteries d. veins e. other capillaries
Color blindness is an X-linked trait in humans. If a color-blind woman marries a man with normal
vision, the children will be a. all color-blind daughters, but normal sons. b. all color-blind sons, but carrier daughters. c. all normal sons, but carrier daughters. d. all color-blind children. e. all normal children.