Determine when the fetal lungs begin producing surfactant and explain why it is important
What will be an ideal response?
The fetal lungs begin producing surfactant during month 6 of prenatal development. Without surfactant, alveoli collapse during exhalation and are difficult to re-inflate due to alveolar surface tension. Infants born before 24 weeks develop infant respiratory distress syndrome (IRDS) because surfactant is not produced in the alveoli until this time.
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A subthreshold stimulus evokes only a small muscle twitch instead of a full tetanic contraction
Indicate whether this statement is true or false.
________ is the physiological process that monitors and maintains a stable internal environment or equilibrium.
A. Homeostasis B. Negative feedback loop C. Positive feedback loop D. Metabolism
The internal environment of a multicellular organism is the fluid surrounding cells, through which life-sustaining exchanges are made
a. True b. False Indicate whether the statement is true or false
A neuron receives a stimulus. Which of the following events happens next?
A. Repolarization of the membrane B. A resting membrane potential is established C. Threshold is reached D. Hyperpolarization of the membrane E. A local potential develops