The following structures are found in the opened part of the dorsal surface of medulla oblongata:
a) pyramidal decussation
b) olive
c) vagal trigone
d) facial colliculus
e) gracile tubercle
Ans: c) vagal trigone
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An action potential is regarded as an example of a positive feedback. Which of the following examples below best illustrates the positive feedback aspect of an action potential?
A) The sodium potassium pump consistently moves ions as long as ATP is available, and regardless of membrane potential changes. B) Potassium permeability is about 25 times greater than sodium ions. C) Voltage gated potassium ion channels open slowly and remain open long enough to cause hyperpolarization. D) A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarizing stimulus. This stimulus will open still more voltage gated sodium ion channels.
Intrinsic factor is secreted by which cells of the gastric glands?
A) mucous cells B) chief cells C) peptic cells D) parietal cells
A cancerous tumor found in bone would be considered what type of tumor?
A. Sarcoma B. Leukemia C. Lymphoma D. Carcinoma
What are the two major anatomical regions of the body?
A. Cephalic and thoracic B. Axial and abdominal C. Axial and appendicular D. Appendicular and cephalic