How will the kidney and relevant hormones respond to drinking large amounts of pure water, while on a low NaCl diet?
What will be an ideal response?
Answer: Drinking lots of water while on a low NaCl diet will tend to lower the osmotic pressure of blood, which will be sensed by the brain osmoreceptors, inhibiting the release of vasopressin, and causing less water to be reabsorbed by the collecting ducts and more urine to be produced. An increase in plasma volume will also distend the heart, causing the release of atrial natriuretic peptide, which dilates the afferent arteriole and increases glomerular filtration rate, increasing urine output. Atrial natriuretic peptide also inhibits aldosterone, reducing Na+ reabsorption, further increasing urinary water loss.
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Which connective tissue protein fibers form a meshlike framework that provides structural support for many organs?
A. Mucoid fibers B. Elastic fibers C. Collagen fibers D. Reticular fibers E. Cartilaginous fibers
When energy is released during catabolism, it is temporarily trapped in high energy bonds or electrons of certain compounds. Which of the following is NOT associated with carrying energy?
A) FADH2 B) NADPH C) ATP D) NADH E) DNA
Adipose tissue is located within the hypodermis
Indicate whether the statement is true or false
The _____ phase of the action potential in _____ cells is due to a _____
a. rising, autorhythmic cells, rapid Ca2+ influx b. rising, contractile cells, rapid Na+ influx c. plateau, contractile cells, slow Ca2+ influx d. All of the above correctly complete the sentence. e. Only b and c correctly complete the sentence.