A heartbeat is started by what structure?
A. Sinoatrial node
B. Atrioventricular node
C. Atrioventricular bundle
D. Purkinje fibers
Answer: A
You might also like to view...
What type of epithelium has the appearance of a group of pillars lined up next to each other?
A. Simple cuboidal B. Simple columnar C. Simple squamous D. Transitional E. Stratified squamous
Which of the following descriptors regarding cytoplasm is false?
A) contains less protein than extracellular fluid B) the material that fills a cell C) syrupy or gel-like consistency D) includes cytoskeleton E) includes cytosol
A double covalent bond involves
?A. the sharing of one pair of electrons.? B. the sharing of two pairs of electrons.? C. the donation of one pair of electrons.? D. the donation of two pairs of electrons.
Answer the following statements true (T) or false (F)
1. The carbon dioxide that is exhaled reduces the amount of carbonic acid in the blood. 2. A decreased breathing rate reduces the amount of carbonic acid removed and causes a rise in the pH of the blood. 3. A decrease in breathing rate reduces the amount of carbonic acid removed and causes an increase of hydrogen ions in the blood. 4. Hyperventilation can cause acidosis. 5. Hyperventilation would remove more carbonic acid than normal and would cause a decrease in the hydrogen ion concentration.