Thyroxine is a peptide hormone, but its mechanism is different from other peptide hormones. Which of the following statements is true concerning this difference?
A) It causes positive feedback.
B) It does not require a second messenger to effect a response.
C) It is very specific in the cell type it targets.
D) It is a stimulant of cellular metabolism and targets all cells.
B) It does not require a second messenger to effect a response.
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As compared to the male, the angle of the pubic arch is greater in the female pelvis.
Answer the following statement true (T) or false (F)
The kidneys are covered by a fibrous layer of connective tissue called the ________.
A. renal pelvis B. renal sinus C. renal capsule D. renal hilum
Components of the lymphoid system include the:
(1) pancreas (2) spleen (3) lymphatic vessels (4) thymus (5) lymph nodes (6) thoracic duct A) 1, 3, 5, 6 B) 1, 4, 6 C) 2, 3, 4, 5, 6 D) All of the answers are correct. E) None of the answers are correct.
What part of the retina contains only cones and is the area of sharpest vision?
A. Macula lutea B. Optic disc C. Fovea centralis D. None of these answers are correct.