During inspiration, intercostal muscles function to
A) flatten the diaphragm.
B) pull the rib cage up and out, so that lung volume increases.
C) constrict the lungs so that intrapulmonary pressure increases.
D) separate the layers of pleural membranes.
E) increase blood flow to lung tissue.
B
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Answer the following statement true (T) or false (F)
The fusion of a sperm cell with two polar nuclei in the ovule forms the:a
cotyledon. b. endosperm. c. fertilized egg. d. zygote. e. embryo.
One true characteristic of all animals is that they:a
are mobile. b. have a brain. c. are heterotrophs. d. have an organ system. e. only show sexual reproduction.
In the binomial nomenclature system designed by Linnaeus, every living organism is assigned two names.
a. true b. false