Capillaries are best described as
A) thin walled vessels that carry blood deficient in oxygen.
B) thick walled vessels that carry blood rich in oxygen.
C) microscopic vessels in which blood exchanges material with the interstitial fluid.
D) thick walled vessels that convey blood away from the heart.
E) thin walled vessels that convey blood toward the heart.
C) microscopic vessels in which blood exchanges material with the interstitial fluid.
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Assume that the allele controlling brown eyes (B) is dominant over that controlling blue eyes (B) in human beings. (In actuality, eye color in humans is an example of polygene inheritance, which is much more complex than this
) A blue-eyed man marries a brown-eyed woman, and they have six children, all brown-eyed. What is the most likely genotype of the father? What is the most likely genotype of the mother? If a seventh child had blue eyes, what can you conclude about the parents' genotypes? What will be an ideal response
Hemoglobin
a. combines preferentially with O2 over any other substance b. is known as carboxyhemoglobin when combined with carbon dioxide c. plays a critical role in determining the amount of O2 exchanged between alveoli and blood d. has characteristics a and c e. has all of the above characteristics
The ________ is usually the largest organelle in a eukaryotic cell. It contains the genetic material of the cell, which directs cellular activity
A) nucleus B) mitochondrion C) lysosome D) Golgi apparatus
After acetylcholine is released from the axon terminal, it
A. diffuses out of the sarcoplasmic reticulum. B. binds to its receptors on the sarcolemma. C. binds to troponin to expose active sites on actin. D. binds to active sites on actin.