The function of the circle of Willis is to equalize blood pressure to the brain and provide an alternate blood source should one of the vessels involved be compromised.
Answer the following statement true (T) or false (F)
True
Rationale: See the subsection “Circle of Willis” in the section “Arteries.”
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Gans's and Northcutt's "new head" hypothesis proposes that
A) Vertebrates have a diffuse nerve sensory system. B) More complex teeth in the head evolved in response to a more predatory lifestyle. C) The success of vertebrates was linked to specializations of the head. D) B and C
Answer the following statements true (T) or false (F)
1) The expanded portion of the axonal branch that faces a region of the sarcolemma are called synaptic terminals 2) A region of the sarcolemma that faces an expanded portion of an axonal branch is the motor end plate. 3) A space that separates the sarcolemma from the axon membrane is the synaptic vesicle. 4) The cytoplasm of the synaptic knob contains mitochondria as well as vesicles containing acetylcholine. 5) The sarcoplasmic reticulum conducts action potentials from the sarcolemma into the cell.
Match the component of blood plasma with the appropriate description.A. The suspending medium for blood componentsB. The most abundant plasma proteinC. A protein that functions in clottingD. A plasma protein that is involved in immunityE. Involved in osmosis, membrane potentials, and acid-base balanceIons
Fill in the blank(s) with the appropriate word(s).
If the cerebrum was no longer able to communicate with the midbrain, what type of tract would you suspect has been damaged?
A. Commisural B. Association C. Ascending D. Projection