During rapid depolarization of a ventricular contractile cell, the voltage-gated sodium channels close when the membrane potential reaches approximately
A) -90 mV.
B) -30 mV.
C) 0 mV.
D) +30 mV.
E) +90 mV.
D) +30 mV.
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In the early stages of intramembranous ossification, osteoblasts deposit a soft collagenous tissue called ________.
Fill in the blank(s) with the appropriate word(s).
From superficial to deep, the meninges occur in which order?
A. Pia mater, dura mater, arachnoid B. Dura mater, arachnoid, pia mater C. Dura mater, pia mater, arachnoid D. Arachnoid, pia mater, dura mater E. Pia mater, arachnoid, dura mater
Which of the following characteristics makes hemoglobin's structure such a good match for its function as an oxygen carrier?
A) Each hemoglobin molecule can bind two oxygen molecules. B) Each hemoglobin molecule can bind four oxygen molecules. C) Each hemoglobin binds irreversibly to an oxygen molecule. D) Each hemoglobin molecule can bind one oxygen molecule. E) Each hemoglobin molecule can't be saturated by oxygen molecules.
A person with type B blood can receive blood from blood type(s) ________
A) AB, B B) B, O C) A, B, AB, O D) B, O, AB