The blood-brain barrier
A. permits passage of foreign substances from the blood to the neurons.
B. prohibits the transport of amino acids and glucose to the neurons.
C. prohibits the removal of waste materials from the neurons.
D. protects neurons from toxic substances in the blood.
E. does not prevent fluctuations in the composition of the blood from affecting the functions of the brain.
D
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What stops the rising phase of the action potential?
A) The sodium activation gate closes. B) The K+ gate closes. C) The Na+ activation gate opens. D) The Na+ inactivation gate closes. E) The Na+ inactivation gate opens.
An action potential requires ______
A) voltage-gated sodium channels to open B) sodium to flow with its electrochemical gradient C) chemically gated sodium channels to open D) voltage-gated sodium channels to open and sodium to flow with its electrochemical gradient
Desmosomes form channels that allow each cardiocyte to electrically stimulate its neighbors
Indicate whether the statement is true or false
The body cavity which is protected by the ribcage and bounded inferiorly by the diaphragm is the _________ cavity.
A.) abdominal B.) vertebral C.) cranial D.) thoracic E.) pelvic