All of the following are true of steroid hormones except that they
A) are produced by the adrenal medulla.
B) are derived from cholesterol.
C) are produced by reproductive glands.
D) bind to receptors within the cell.
E) are lipids.
Answer: A
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Select the correct statement about lymphoid tissue
A) Lymphoid macrophages secrete antibodies into the blood. B) T lymphocytes act by ingesting foreign substances. C) Once a lymphocyte enters the lymphoid tissue, it resides there permanently. D) Lymphoid tissue is predominantly reticular connective tissue.
The line where gingiva and alveolar mucosa meet is known as the
A. sulcus terminalis. B. mucobuccal fold. C. vermilion border. D. mucocutaneous junction. E. mucogingival junction.
The volume of blood ejected from each ventricle during a contraction is called the
A) end-diastolic volume. B) end-systolic volume. C) stroke volume. D) cardiac output. E) cardiac reserve.
Dr. Clark has been lecturing for 3 hours and her ears are beginning to "pop." Which of the following best explains her condition?
A. Inflammation of the inner ear is causing fluid to compress the oval window, leading to the popping noise. B. Inflammation of her larynx is blocking airflow through her external auditory canal, resulting in lack of pressure equilibrium across her oval window. C. Inflammation in her middle ear is causing fluid to build up in the external auditory canal, leading to sudden movement of her tympanic membrane. D. Inflammation of her pharynx is blocking airflow through her auditory tubes, resulting in uneven pressure across her tympanic membranes.