Which brain areas lack a blood-brain barrier, and what purpose does this absence serve?
What will be an ideal response
The blood-brain barrier is absent around the vomiting center of the brain stem, so that it can monitor the blood for poisonous substances. It is also absent around the hypothalamus, so that it can monitor the chemical composition of the blood and adjust water balance and other factors.
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Which of the following imaging techniques causes particles within atoms to line up in uniform direction allowing the imaging of soft tissue?
A) PET scan B) ultrasound C) digital subtraction angiography D) MRI E) CT scan
At what region of the neuron are action potentials first produced?
A. Cell body B. Axon hillock C. Dendrites D. Initial segment of an axon
Atoms that are alike combine to form the next stage of matter, which is a(n) _____.?
A) ?compound B) ?molecule C) ?element
Reduction of fluid losses at the kidneys due to the retention of Na+ is the action of
A) antidiuretic hormone. B) calcitonin. C) aldosterone. D) cortisone. E) oxytocin.