Describe the morphology and physiology of the baroreceptor reflex (where is the sensor and integrator, and what are the output processes in response to high or low blood pressure?)
What will be an ideal response?
Answer: The sensors, termed baroreceptors, are stretch receptors located in the carotid sinuses and the arch of the aorta. These vary their action potential frequency in response to changes in arterial pressure, signaling the integrating center in the medullary cardiovascular center, located in the medulla oblongata. If blood pressure is too high, there is a decrease in sympathetic nervous system output, and increase in parasympathetic output, decreasing heart rate and contractility, and reducing peripheral vasoconstriction and total peripheral resistance. If blood pressure is too low, there is an increase in sympathetic nervous system output, and decrease in parasympathetic output, increasing heart rate and contractility, increasing peripheral vasoconstriction and total peripheral resistance, and squeezing the veins to increase venous return to the heart (increasing cardiac output).
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Why does meiosis pass through two complete cycles?
A. Because two cycles are necessary to produce the proper shape of the gametes B. So that the zygote will have the diploid number of chromosomes C. Because the chromosomes are still double-stranded at the end of meiosis I D. To allow crossing over to occur E. To assure that the gametes will be of the correct size
The antecubital region is ________ to the brachial region.
Fill in the blank(s) with the appropriate word(s).
The QRS complex represents ____________________.
atrial repolarization atrial depolarization ventricular repolarization ventricular depolarization none of the choices are correct
The conjugation of nonpolar compounds in the liver makes them ________ and water ________.
A. cationic; insoluble B. polar; insoluble C. polar; soluble D. cationic; soluble