1.) The FLATTTEST part of the oxyhemoglobin dissociation curve, is where hemoglo
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Question
1.) The FLATTTEST part of the oxyhemoglobin dissociation curve, is where hemoglobin binds TIGHTLY to oxygen and does not give it up. It is found at a PO2 of: a) 104 as in the lungs and arterial blood b) 40 or lower as in the tissues
2.) This best describes the PO2 and PCO2 of the blood first entering LUNG capillaries of a body at rest:
a) PO2 is 100-105 mm Hg in the blood first entering the lung capillaries from the pulmonary arteries; PO2 is 40 mm Hg in the alveoli, so oxygen leaves the blood and enters the alveoli;
PCO2 is 40 mm Hg in the blood first entering the lung capillaries from the pulmonary arteries, PCO2 is 45 mm Hg in the alveoli, so CO2 leaves the blood and enters the alveoli and is exhaled
b) PO2 is 40 mm Hg in the blood first entering the lung capillaries from the pulmonary arteries, PO2 is 100-105 mm Hg in the alveoli, so oxygen enters the blood until equilibrium is reached; PCO2 is 45 mm Hg in the blood first entering the lung capillaries from the pulmonary arteries, PCO2 is 40 mm Hg in the alveoli, so CO2 leaves the blood until equilibrium is reached and enters the alveoli and is exhaled
3.) This best describes the PO2 and PCO2 of the blood first entering TISSUE capillaries of a body at rest:
a) PO2 is 100-105 mm Hg in the blood first entering the tissue capillaries; PO2 is 40 mm Hg in the tissue cells, so oxygen leaves the blood and enters the tissue cells until the blood PO2 is 40 mm Hg;
PCO2 is 40 mm Hg in the blood first entering the tissue capillaries; PCO2 is 45-46 mm Hg in the tissue cells , so CO2 leaves the cells and enters the blood until the blood PCO2 is 45-46
b)PO2 is 40 mm Hg in the blood first entering the tissue capillaries; PO2 is 1000 mm Hg in the tissue cells, so oxygen leaves the cells and enters the blood until the blood PO2 is 100 mm Hg;
PCO2 is 45-46 mm Hg in the blood first entering the tissue capillaries; PCO2 is 40 mm Hg in the tissue cells, so CO2 leaves the blood and enters the tissue cells until the blood PCO2 is 40
4.) What is the most important of these three choices, in determining our rate and depth of breathing?
a) PO2 b) PCO2 c) pH
5.) What is the least important of these three choices, in determining our rate and depth of breathing?
a) PO2 b) PCO2 c) pH
6.) Carbon dioxide, CO2, can be carried in the blood in the form of bicarbonate ion, HCO3-. Bicarbonate ion can play another important role in the blood plasma, besides transporting CO2. That role is:
a) carrying oxygen also
b) an important nutrient to make ATP
c) serves as part of the most important extracellular fluid buffer system
7.) The respiratory passages are always open, except for when swallowing.
a) true
b) false
8.) The secretion of thyroid hormone is controlled by:
a) TSH from the hypothalamus
b) TSH from the anterior pituitary
c) thyroxine from the anterior pituitary
9.) Which of these are amongst the classes of hormones made by the adrenal cortex?
A) mineralcorticoids like aldosterone
b) glucocorticoids like cortisol
c) sex hormones like minor amounts of estrogen and testosterone
d) all of the above
e) a and b only, the gonads produce all the sex hormones
10.) What is true?
a) Insulin acts as a transport protein, carrying glucose across the cell membrane
b) Insulin facilitates/signals movement of intracellular glucose transport proteins to insert themselves in the cell membrane to bring glucose across by facilitated diffusion.
Explanation / Answer
1) a (104 as in lungs and arterial blood)
2) b
3) a
4) b(PCO2)
5) a (PO2)
6) c (Serves as buffer maintains the blood pH)
7) a. True( Duing swallowing epiglottis closes glottis to avoid entry of food in air wind as pharynx is common for food and air)
8) b (Thyroid releasing hormone from hypothalamus stimulates TSH from pituitary, which stimulates thyroid hormone release)
9)d. All of the above
10) b
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