Name the two factors that influence the membrane potential.
What will be an ideal response?
1. the concentration gradients of ions across the membrane
2. the membrane permeability to those ions
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What function does placental PTHrp (parathyroid hormone–related peptide) serve? a. It helps prepare the mammary glands for lactation
b. It increases maternal plasma Ca2+ levels for use in calcifying fetal bones. c. It softens the cervix in preparation for cervical dilation at parturition. d. It maintains the corpus luteum of pregnancy. e. It stimulates growth of the myometrium.
Why would an individual with atopic allergic asthma experience difficulty breathing?
A. IgE antibodies bind to the inhaled antigens, causing an inflammatory reaction that decreases gas exchange. B. Mast cells, which stimulate vasodilation of the airways, are less active in persons with allergies. C. Leukotrienes cause constriction of the bronchioles, producing airway obstruction. D. All of the choices are correct.
The __________ of a resting homeotherm is the range of ambient temperature where its metabolic rate is minimal
A) Thermoneutral zone B) Preferred temperature C) Optimal temperature range D) Idealized thermal region Fill in the blank with the correct answer.
The gap junctions in cardiac muscle are part of specialized cell junctions that are localized to the ________.
Fill in the blank(s) with the appropriate word(s).