The force responsible for normal expiration is supplied by the
A. elastic recoil of tissues and surface tension.
B. external intercostal muscles.
C. contraction of smooth muscles in air passages.
D. diaphragm.
Answer: A
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A premature baby born at 27 weeks gestation is suffering from respiratory distress syndrome. What is the probable cause?
A. The foramen ovale failed to close at birth. B. Fluid in the lungs was not adequately reabsorbed by the blood and lymphatic capillaries. C. The alveoli are not adequately developed by 27 weeks. D. The breath was not vigorous enough to pop open the alveoli. E. There is not enough surfactant to keep the alveoli from collapsing.
Which class of disease is characterized by uncontrollable cell growth?
A. Infectious diseases B. Trauma C. Cancers D. Immune disorders
What contributes to the calculation of the mass number?
A) sum of electrons and neutrons B) sum of protons, neutrons, and electrons C) sum of protons and electrons D) sum of protons and neutrons
Dendrites in a neuron send outgoing signals to other cells
Indicate whether the statement is true or false