_____ is known as a cardiac pacemaker
a. Diastole
b. Systole
c. Cardiac muscle
d. SA node
e. AV node
ANSWER: d
You might also like to view...
The ultimate source of energy for humans comes from what source?
A. The sun B. Plants C. Water D. Air E. Animals
Which of the following scientists revolutionized biology by demonstrating that living organisms were also governed by the laws of physics and chemistry by synthesizing urea in the laboratory from ammonium cyanate?
A) Wöhler B) van Leeuwenhook C) Mendel D) Schwann E) Rohrer
Which of the following would not occur in the structure marked by the letter "A"?
a. warming of air b. odor detection c. gaseous exchange of oxygen and carbon dioxide to and from blood d. filtering of dust from air e. moisturizing of dry air
The 3? end of eukaryotic pre-mRNAs are changed by:
a. removing the last phosphate group. b. adding a "cap." c. copying the last few bases so that it can form a duplex structure. d. adding 100?250 adenine nucleotides. e. phosphorylation of the mRNA molecule