Iron atoms help our blood transport oxygen. Describe each level of anatomical structural complexity for an iron atom in your blood, working from the simplest level (atom) to the most complex (organism).
What will be an ideal response?
The iron atom helps make up a hemoglobin molecule. The hemoglobin molecule helps make up a red blood cell. The blood cell helps make blood, a connective tissue. Blood travels within vessels, which are organs. All of this is part of the cardiovascular system, which helps make up the person, the organism.
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An acid:
a. has a pH greater than 7 b. has a pH less than 7 c. has more OH– ions than H+ ions in solution d. both A and C above
A friend who has GERD tells you that her doctor suggested she sleep on her left side at night. Why?
A. The stomach sits largely on the left side so lying on your left side helps keep the contents in the stomach away from the lower esophageal sphincter. B. The stomach sits largely on the right side so lying on your left side helps keep the contents in the stomach away from the lower esophageal sphincter. C. The stomach sits largely on the left side so lying on your left side helps keep the contents in the stomach away from the lower pyloric sphincter. D. The stomach sits largely on the right side so lying on your left side helps keep the contents in the stomach away from the lower pyloric sphincter.
Which of the following statements concerning hemoglobin is correct?
a. the presence of hemoglobin keeps the blood PO2 low and favors O2 movement into the blood despite a very large transfer of O2 until hemoglobin is completely saturated. b. hemoglobin can combine with O2, CO2, H+, and CO. c. hemoglobin unloads more O2 in the presence of increased tissue acidity. d. hemoglobin buffers against changes in pH due to respiratory carbonic acid. e. all of these answers.
The renin-angiotensin system in the kidneys helps to regulate:
A. heart rate. B. cardiac contractility. C. blood pressure. D. the release of ADH.