Simple squamous epithelium can be found in the lungs because ________.
A. it functions to aid diffusion of gases into and out of the blood
B. it uses multiple cell layers to protect delicate lung tissue
C. it produces serous fluid, which helps trap inhaled particles
D. it produces collagen, which are important in strengthening lung tissue
Answer: A
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Which of the following situations best represents a homeostatic mechanism?
A. After going outside on a hot day, the core body temperature increases. B. A person who becomes very nervous begins to sweat profusely. C. As age increases, the amount of calcium in bones tends to decrease. D. After eating a large batch of salty popcorn, levels of salt in the urine increase. E. Increasing the size of fast-food restaurant portions causes body weight to increase.
Surfactant is necessary to prevent collapse of the alveoli in the lung because in its absence water molecules
A. vaporize and take up much less space.?B. are more strongly attracted to each other by van der Waals forces.?C. are more strongly attracted to each other by cohesive forces.?D. congregate around nearby proteins to which they adhere.
The four factors that influence bulk flow include all of the following except:
a. capillary blood pressure b. plasma colloid osmotic pressure c. interstitial fluids hydrostatic pressure d. intracellular hydrostatic pressure e. interstitial fluid-colloid osmotic pressure
The series of membranous channels that surround each myofibril is the
A) Sarcolemma. B) Sarcoplasmic reticulum. C) Myolemma. D) Sarcoplasm. E) Transverse tubule.