Stretch marks that appear on a pregnant woman's abdomen result from increased steroid hormone levels.
Answer the following statement true (T) or false (F)
True
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You may have noticed that after a large meal you have had some difficulty breathing. Which explanation is most accurate with regard to this situation?
A. The food presses on the bronchi, making air flow difficult. B. The large quantity of food retards pulmonary blood flow. C. Oxygen to the lungs is restricted due to fullness in the stomach. D. A full stomach impedes contraction of the diaphragm, limiting inhalation.
Secretin and cholecytostokinin are produced and secreted by cells in the lining of the alimentary tract. Which of the following statements about these two substances is true?
(a) they are produced by the main cells of the stomach (b) they are digestive enzymes produced by the duodenum (c) they are produced by the paneth cells (d) they are hormones that have target cells in the pancreas and biliary tract. They are produced by diffuse neuroendocrine cells (DNES cells) (e) they are produced by Brunner glands and released into the lumina of the crypts of Lieberkuhn.
Connective tissue is made of which three essential components?
What will be an ideal response?
What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation?
a. stimulation of ACh receptors b. diffusion of Na+ back into transverse tubules c. return of Ca2+ into the sarcoplasmic reticulum d. breaking the bond with tropomyosin