Communication between cells is essential to coordinate the activity of the trillions of cells that make up the human body. Which of the following is/are directly involved in carrying out communication between cells?
A. Receptor proteins of the plasma membrane
B. Mitochondria
C. Chemical signal molecules released by cells
D. Lipid bilayer of the plasma membrane
E. Both "Receptor proteins of the plasma membrane" and "Chemical signal molecules released by cells" are correct.
Answer: E
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Which of the types of receptors listed below is primarily used for detecting light rays under bright light conditions?
a) olfactory hair cells b) rods c) cones d) ganglion neurons e) amacrine cells
Which of the following is not a function of the axial skeleton?
A) provides an attachment for muscles that move the axial skeleton B) provides an attachment for muscles that move the head, neck, and trunk C) provides an attachment for muscles involved in respiration D) provides an attachment for calf muscles E) None of the answers is correct.
When people aspirate liquids or food into their lungs, the liquid or food most commonly enters the right lung rather than the left lung. This is because the right primary bronchus is __________ than the left primary bronchus
A. longer B. thinner C. more vertical D. less ciliated E. shorter
This figure illustrates epiphyseal plate morphology. Which zones are considered to be bone tissue?
A. 5 B. 1, 2, 3 C. 1 D. 4, 5 E. 3, 4, 5