From where do parasympathetic preganglionic neurons originate?
A. Brainstem
B. Sacral region of the spinal cord
C. Thoracic and lumbar region of the spinal cord
D. Brainstem and sacral region of the spinal cord
Answer: D
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Which muscle forms the floor of the mouth?
A. Mylohyoid B. Omohyoid C. Genioglossus D. Digastric E. Hyoglossus
All of the following statements are true of most lymph tissues except:
A. they house lymphocytes and macrophages. B. they are largely composed of reticular connective tissue. C. they are the site of lymphocyte proliferation. D. the B lymphocytes are able to secrete antigens into the blood.
DNA replication is called semiconservative because ________.
A. each daughter cell receives one new chromatid and one old chromatid B. each daughter DNA consists of one new nucleotide and one old nucleotide C. each daughter DNA consists of one new chromatid and one old chromatid D. each daughter DNA consists of one new helix and one old helix E. each daughter cell receives one new helix and one old helix
The two heart reflexes directly respond to changes in
A) blood volume. B) hormones released. C) oxygen levels in the blood. D) calcium concentrations. E) the pH of blood.