How is a fall in blood pressure counteracted by the secretion of aldosterone? What will be an ideal response?
Concepts to Consider: A fall in blood pressure is caused by a decrease in volume of blood and
interstitial fluid. This stimulates the secretion of the enzyme renin by the juxtaglomerular apparatus,
which is a small group of cells located where the renal tubule meets the afferent and efferent arterioles.
Renin converts angiotensinogen, a plasma protein, to angiotensin. An enzyme from the lungs then
converts angiotensin into its active form, angiotensin II, which stimulates aldosterone secretion.
Aldosterone, in turn, stimulates the distal tubules and collecting ducts to increase sodium reabsorption.
This helps restore fluid volume and normal blood pressure.
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Which of the following soil horizons is topsoil?
a. the C horizon b. the B horizon c. the A horizon d. the O horizon
Broad scale regions dominated by similar types of ecosystems are called
A) communities. B) biospheres. C) biomes. D) landscapes.
Safety considerations in the Microbiology laboratory are crucial for protecting personnel. However, it is also important to think about “protecting” the microorganisms in the experiment that you are performing and not contaminating your culture. Lab workers who are carriers, or who are sick, can contaminate cultures. A pure culture could also be contaminated with another lab strain. What precautions must be taken to prevent contamination of a pure culture?
A) Use of gloves, disinfecting gloves between handling cultures, handling cultures only in a biosafety cabinet, and using lab materials for only 2-3 cultures prior to disposal or autoclaving B) Use of gloves, disinfecting gloves between handling cultures, handling cultures on an open benchtop, use lab materials for only one culture before disposal or autoclaving C) Use of gloves, disinfecting gloves between handling cultures, handling cultures only in a biosafety cabinet, use lab materials for only one culture before disposal or autoclaving
Which of the following is not a metabolic syndrome risk indicator?
a. High blood pressure b. High HDL cholesterol c. Elevated glucose d. Elevated triglycerides