Predict the effect on the ventricles if the AV node delay was shorter than normal
What will be an ideal response?
Ventricles would not have the opportunity to fill with blood before contraction if the AV node delay was shorter than normal. The action potential may flow backward from the AV bundle into the AV node and atria as well. AV node delay is the time it takes for the action potential to spread from the SA node to the AV bundle. This time delay allows the atria an opportunity to depolarize and contract before the ventricles, giving the ventricles time to fill with blood. The AV node delay also prevents current from flowing backward from the AV bundle into the AV node and atria.
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James has a hemoglobin measurement of 16 g/100 ml blood. This is ________.
A) above normal B) normal only if James is an infant C) abnormally low D) within the normal range
Tom gets a cut on his hand. After several days he notes swelling, pain, heat, and redness. Upon opening the wound to relieve the pressure, the presence of pus is noted. What has happened to the wound?
What will be an ideal response
A short passageway that connects the uterus with the exterior of the body is the ________.
Fill in the blank(s) with the appropriate word(s).
Many pituitary hormones are secreted in a circadian rhythm. A structure important to the regulation of circadian hormonal rhythms is the:
A. paraventricular nucleus B. supraoptic nucleus C. superior fornix D. suprachiasmatic nucleus E. arcuate nucleus