What is a neurilemma?
A. The cell membrane of a neuron
B. The layer of connective tissue that surrounds an axon
C. The outermost layer of an oligodendrocyte
D. The outermost layer of a Schwann cell
E. The myelin sheath that surrounds an axon in the PNS
D. The outermost layer of a Schwann cell
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Which of the following does not contribute to the establishment of a vertical osmotic gradient in the interstitial fluid of the renal medulla?
a. The renin-angiotensin-aldosterone system b. Countercurrent multiplication in the long loops of Henle of juxtamedullary nephrons c. Urea recycling between the collecting tubule and long loops of Henle d. All of the above contribute to the establishment of the gradient. e. None of the above contribute to the establishment of the gradient.
Which parts of the following statement are true? The cardioacceleratory center activates sympathetic neurons and the cardioinhibitory center controls parasympathetic neurons
A) The first part of the statement is true but the second part is false. B) The first part of the statement is false but the second part is true. C) Both parts of the statement are true. D) Both parts of the statement are false.
The tough structure that surrounds the heart and helps reinforce and maintain position of the heart is the
A) mediastinum. B) epicardium. C) pericardial sac. D) pleural cavity. E) aorta.
Which of the following best describes the structure of the plasma membrane?
A) The plasma membrane is a double layer of protein enclosing the plasma. B) The plasma membrane is composed of cristae. C) The plasma membrane is a phospholipid bilayer surrounding the cell. D) The plasma membrane is a single-layered membrane that surrounds the nucleus of the cell.