Describe the electrical events that occur during the rising and falling phase of an action potential
What will be an ideal response?
The rising phase of the action potential (depolarization) is due to a sodium ion influx induced by an explosive increase in sodium ion permeability at threshold. During this phase, voltage-gated sodium channels open and allow sodium influx. The falling phase (repolarization) is brought about by a potassium ion efflux caused by a marked increase in potassium ion permeability occurring simultaneously with an inactivation of sodium channels at the peak of the action potential. The outward potassium current is due to the delayed opening of voltage-gated potassium channels which are activated at threshold and then exhibit a delayed opening.
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During the inflammation response, what components of the immune system are sent to the invaded or injured area?
a. eosinophils and basophils b. monocytes and fatty acids c. macrophages and eosinophils d. neutrophils and monocytes e. natural killer cells and plasma proteins
Polygenic traits include
A) eye color and hair colors other than pure blond or red. B) a lack of A and B surface antigens and presence of RH factor. C) inability to roll the tongue into a U-shape and near-sightedness. D) photic sneeze reflex and attached earlobes. E) ability to taste phenylthiocarbamate and color blindness.
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A. fetal B. embryonic C. infant D. germinal E. neonatal
Primordial follicles consist of an oocyte and ________
A) a single layer of surrounding squamous follicle cells B) a fluid filled cavity called antrum C) multiple layers of surrounding granulosa cells