Oxygen is supplied to the heart by veins
Indicate whether the statement is true or false
Answer: False
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Which of the following cell types would be found in places such as the brain or the spinal cord?
A. Neurons B. Simple columnar epithelium C. Smooth muscle cells D. Squamous epithelial cells
Optimal health of tissues is achieved when high-density lipoproteins (HDLs) and low-density lipoproteins (LDLs) are present in equal amounts within the bloodstream
Indicate whether the statement is true or false
The dermis contains blood vessels and nerve fibers while the epidermis does not
Indicate whether the statement is true or false
Acetylcholine is the main neurotransmitter released by
A. preganglionic sympathetic neurons and motor neurons. B. preganglionic sympathetic neurons and cells of the adrenal medulla. C. motor neurons and postganglionic sympathetic neurons. D. preganglionic sympathetic neurons and postganglionic sympathetic neurons. E. cells of the adrenal medulla and postganglionic parasympathetic neurons.