The iron that has been transferred to the liver after the aged erythrocytes were phagocytized is stored by the protein ________.
Fill in the blank(s) with the appropriate word(s).
ferritin
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The origin of the frontalis muscle is the
A) mandible. B) frontal bone. C) occipital bone. D) epicranial aponeurosis. E) forehead.
The hormone that is released to enhance the fight-or-flight reaction is
A) epinephrine. B) oxytocin. C) prolactin. D) thyroid hormone. E) antidiuretic hormone.
Which of the following reasons explains why channels are required in membranes in order for neurons to perform their function?
a. Neurons have to function in reception (e.g. sensory); therefore, they must be able to switch channels in order to get the appropriate information. b. The lipid bilayer is impermeable to ions and polar molecules, and ion flow through the membrane is essential for nervous transmission of information. c. Channels permit the flow of water through the membrane, and water is necessary for hydrolysis reactions in the cytoplasm. d. Channels are required in order to keep Ca2+ levels low inside the cytoplasm.
A disease that affects the production of collagen found in gomphoses would lead to:
a) the inability of teeth to withstand the pressure of chewing. b) the skull being unsuitable to protect the brain. c) the long bones to cease in growing. d) the vertebrae compressing and not being able to resist tension.