Which of the following chemical equations shows what happens to part of the CO2 picked up by blood in tissues?
a) H+ + HCO3- ? H2CO3? CO2 + H2O
b) CO2 + H2O ? H2CO3- ? H+ + HCO3-
c) CO2 + H2CO3- ? H+ + HCO3-
d) CO2 + H2O ? HCO3-
Answer: b) CO2 + H2O ? H2CO3- ? H+ + HCO3-
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In cardiac muscle,
A) calcium ions are not released from the sarcoplasmic reticulum. B) calcium ions do not bind to troponin molecules. C) calcium ions play no role in the process of contraction. D) about 20 percent of the calcium ion required for contraction comes from outside the cell. E) calcium ions play an important role in repolarizing the membrane after the depolarization phase.
In its protective role, the blood-brain barrier becomes an obstacle in delivering therapeutic drugs to specific regions of the brain in the treatment of a variety of brain disorders
Describe what the blood-brain barrier is made of, and how different compounds are capable of crossing it.
Surgical cutting of the lingual frenulum would occur in which part of the body?
A) tongue B) esophagus C) nasal cavity D) salivary glands
In transamination, the amino group of an amino acid is
A) converted to ammonia. B) converted to urea. C) transferred to a keto acid. D) absorbed by water. E) transferred to acetyl-CoA.