When the arteriovenous anastomoses are constricted by sympathetic nerve fibers, the superficial capillary loops are

a. engorged with blood.

b. collapsed.

c. by passed.

d. not affected?

Based on Earth's geology what would you suspect caused these valleys? a Stream erosion b Glacial erosion c Stream deposition d Marine erosion

In periods of reduced visibility, what equipment is essential to signal the vessel operator's intentions or position?

Which factor has the opposite effect on the solubility of gas solutes as it does on the solubility of solid solutes? polarity surface area temperature motion

For sickle-cell diease, assume S is the dominant allel and s the recessive allele. Which genotypes are possible for offspring of a carrier (Ss) and a person who lacks the sickle-cell allele (SS) ?

How are the proteins used for active transport different from those used for facilitated diffusion?

During a trip to Galapagos island which Observation led Charles Darwin to suspect that organisms change over time

Prudence and Charity are twins raised at the center of a rotating kingdom. Charity goes to live at the edge of the kingdom for a time and then returns home. Discuss which twin is older when they rejoin.

Sue has normal hearing but her sister suffers from deafness determined by a rare recessive allele. what is the probability that sue's phenotypically normal daughter is heterozygous for the gene?

Describe two factors that cause variations in climate?

A demonstration is performed during a lecture on muscle physiology in which a student is asked to fully extend his right arm with the palm up. Two large textbooks are placed on his palm, one at a time.