As compared to the circulatory system of most fishes, the circulatory system of adult amphibians has the advantage of
A. a four-chambered heart.
B. complete separation between oxygenated and deoxygenated blood.
C. partially-separate circuits for gas exchange and systemic delivery of blood.
D. a pocket of the gut that serves as an air bladder.
E. a single circuit.
C. partially-separate circuits for gas exchange and systemic delivery of blood.
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Which one of the following is the function of horizontal cells in the eye?
A. They transmit signals from rods and cones to the optic nerve. B. They receive signals from multiple photoreceptors (rods and cones), integrating and regulating their input. C. They communicate between and among bipolar cells. D. They process of visual input to actually form an image.
________ formation begins with the initial colonization of the pellicle by Streptococcus gordonii, S. oralis, and S. mitis.
Fill in the blank(s) with the appropriate word(s).
What organelle is the site of ATP production?
a. nucleus b. mitochondria c. peroxisomes d. lysosomes e. Golgi body
Lipid A is a(n) (cytotoxin/endotoxin/exotoxin) that stimulates the body to release chemicals that cause fever, inflammation, diarrhea, hemorrhaging, shock, and blood coagulation.
Fill in the blank(s) with the appropriate word(s).