According to the Frank-Starling law
the more calcium available to the heart cell, the more forcefully it will contract.
B. as the volume of blood entering the heart increases, ventricular contractions become more forceful.
C.
the faster the heart rate, the larger the stroke volume.
D.
the greater the resistance from the arteries, the higher the blood pressure.
B
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The largest paranasal sinuses are the ____________________.
Fill in the blank(s) with the appropriate word(s).
In cell-mediated immunity, the antigen (pathogen) is destroyed by:
a. Mast cells b. Cytotoxic killer T cells c. Opsinization of antibodies d. Plasma cells
Answer the following questions true (T) or false (F)
1. The eye contains two cavities situated within the anterior chamber. 2. An astigmatism is an irregular curvature of the cornea or lens which causes rays of light to refract unevenly. 3. Rods are concentrated in the fovea centralis while cones are absent from this region of the retina.
Veins that return blood directly to the heart include the
A. brachiocephalic vein. B. superior vena cava. C. portal vein. D. azygos vein. E. pulmonary arteries.