1- The body's internal environment is separated into compartments by barriers, including epithelial barriers, which may or may not allow for the movements of molecules from one compartment to the next. Which of the following terms most accurately describes these membranes?
answer
Semipermeable or selectively permeable
question
1- What tissue type lines internal hollow organs and external surfaces of the body, providing a barrier between the internal and external environment?
answer
epithelial tissue
question
1- Which of the following accurately represents the order of complexity for the components of the body, from least to most complex?
answer
cells, tissues, organs, organ systems
question
1- What type of tissue separates the internal from the external environment?
answer
epithelial
question
1- The lumen of which of the following systems is part of the INTERNAL environment?
answer
cardiovascular system
question
1- Referring to a membrane as "selectively permeable" describes its ability to ________.
answer
restrict the movement of particular molecules across a membrane
question
1- Connective tissue forms both endocrine and exocrine glands.
answer
False
question
1- Most of the cells of the body are able to directly exchange materials with the external environment.
answer
False
question
1- Intracellular and extracellular fluid are of the same ion composition.
answer
False
question
1- Which of the following statements about homeostasis is FALSE?
answer
Intrinsic control mechanisms maintain the extracellular fluid in a constant state.
question
1- Which of the following is an example of negative feedback?
answer
If blood pressure increases above normal, baroreceptors in major arteries detect the change and send signals to the brain. Certain areas of the brain then send signals to the nerves that control the heart and blood vessels to make the heart beat slower and the blood vessels increase in diameter, which in turn reduce the blood pressure.
question
1- Positive feedback loops are impossible to stop once they have begun.
answer
False
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