The largest anterior trunk muscle is the
A) serratus anterior.
B) rectus abdominis.
C) deltoid.
D) external oblique.
E) pectoralis major.
E) pectoralis major.
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Water molecules can form covalent bonds with other water molecules.
Answer the following statement true (T) or false (F)
A herd that restricts the entrance of new animals is considered which of the following?
A) open B) started C) finished D) closed
The male and female reproductive systems begin as an indifferent stage. If testosterone is present, which of the following occurs?
A. The mesonephric ducts atrophy. B. The mesonephric ducts form the ductus deferens. C. The paramesonephric ducts enlarge to form the scrotum. D. The paramesonephric duct forms the vagina. E. The paramesonephric duct atrophies.
With regard to the action of hormones and neurotransmitters on cellular receptors, which of these describes "amplification"?
A. A single first-messenger molecule activates multiple second-messenger molecules, each of which activate thousands of enzymes. B. Only hydrophilic first-messenger molecules can activate second-messenger molecules within the cell cytosol. C. When the extracellular concentration of a chemical messenger reaches a very high level, it overwhelms transporter molecules and the chemical floods into the cell. D. Some cellular receptors have such low affinity for chemical ligands that it can require a million or more molecules to activate them.