Where in the body would you find low oxygen levels causing vasoconstriction and high levels causing vasodilation?
A) heart
B) kidney
C) lungs
D) liver
C
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Describe the muscular layer of the esophagus
A) inner circular layer and outer longitudinal layer; superior third is skeletal muscle, middle third is mixed skeletal and smooth muscle, inferior third is smooth muscle B) inner longitudinal layer and outer circular layer; superior third is skeletal muscle, middle third is mixed skeletal and smooth muscle, inferior third is smooth muscle C) inner circular layer and outer longitudinal layer; superior third is smooth muscle, middle third is mixed skeletal and smooth muscle, inferior third is skeletal muscle D) inner longitudinal layer and outer circular layer; superior third is smooth muscle, middle third is mixed skeletal and smooth muscle, inferior third is skeletal muscle E) inner circular layer, middle oblique layer, outer longitudinal layer; inner layer is smooth muscle, middle oblique layer is mixed smooth and skeletal muscle, outer longitudinal layer is skeletal muscle
The complex structures of DNA and protein found in the cell nucleus are
A) nucleoplasm. B) chromosomes. C) histones. D) nucleases. E) mitochondria.
Voltage-gated sodium channels are sensitive to changes in the extracellular concentration of
A. potassium ions. B. proteins. C. sodium ions. D. chloride ions. E. calcium ions.
Select the correct statement about lymph transport
A) Under normal conditions, lymph vessels are very high-pressure conduits. B) Lymph transport is only necessary when illness causes tissue swelling. C) Lymph transport is faster than that occurring in veins. D) Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles.