Contractions of the dome-shaped __________ and
the intercostal muscles between the ribs alter the
volume of the thoracic cavity during breathing. Fill in the blank(s) with the appropriate word(s).
Answer: diaphragm
You might also like to view...
Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of:
A. deductive reasoning B. a hypothesis C. inductive reasoning D. an experiment E. a theory
Stem cells are used in which of the following techniques?
a. therapeutic cloning b. development of genetic markers c. DNA profiling d. recombinant DNA technology
In humans, the volume of an egg is 100 times the volume of a sperm. Compared to the amount of chromosomal DNA in an egg, the amount of chromosomal DNA in a sperm is
A) variable but usually less than one-hundredth that of the egg. B) exactly one-hundredth that of the egg. C) one-fourth that of the egg. D) one-half that of the egg. E) equal to that of the egg.
The primary structure of a protein is
A) an alpha helix or a pleated sheet. B) the amino acid sequence of the polypeptide chain. C) composed of two or more polypeptide chains. D) maintained by hydrogen bonds.