The reddish color of the skin of the lips is primarily due to the presence of which pigment?
A) Hemoglobin
B) Carotene
C) Myoglobin
D) Keratin
E) Melanin
A
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A young man is cleaning his ear by sliding a cotton swab into the external acoustic meatus as far as he can. He is met with some resistance and, thinking the swab has hit earwax, he pushes harder. He feels a sharp, extreme pain. After the initial shock, he notices that all he can hear from that ear is a constant ringing and nothing else. What damage has he most likely done to the ear?
A. He pushed and damaged the stapes. B. He has pushed and torn the tympanic membrane. C. He has broken the skin of the external acoustic meatus and the blood is causing the ringing. D. He has pushed and torn the oval window.
Although small quantities of lipids are normally stored in the liver, most of the synthesized triglycerides are bound to __________.
a. hepatocytes in the liver b. transport proteins c. glucose molecules d. adipocytes
What is the number of covalent bonds that an atom of nitrogen can form within a molecule?
?A. 1?B. 2?C. 3?D. 4
What is the role of the somatic nervous system?
to control the contractions of smooth muscles to control the contractions of skeletal muscles to control the secretions of glands to distribute somatic sensory information to the somatosensory cortex