Cross-bridge formation occurs when myosin heads attach to actin molecules located in the thin filaments.
Answer the following statement true (T) or false (F)
True
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The pigment found in vegetables that can make the skin appear orange or yellow is called
A) cadmium. B) carotene. C) hemoglobin. D) keratin. E) melanin.
The membrane lining the interior of the thoracic cavity is called the:
a. visceral pleura b. visceral peritoneum c. parietal pleura d. parietal peritoneum
Which statement regarding control of digestive processes is incorrect?
a. short reflexes influence motility and secretion in localized areas. b. all elements of the short reflexes are contained within the digestive organ's wall. c. hormones play a role. d. osmoreceptors monitor the acidity of the luminal contents. e. there are stretch receptors in the walls of digestive organs.
In the air we breathe, which gas is found in the highest concentration?
A. Hydrogen B. Water vapor C. Nitrogen D. Oxygen E. Carbon dioxide