An older person is found to have a heart rate of fifty-four beats per minute. Which part of the heart should be suspected as controlling this person's heart rate?
A) Intercalated discs B) Bundle of HIS
C) Sinoatrial node D) Atrioventricular node
B
You might also like to view...
The "D" in DIC stands for __________
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. All bones formed by intramembranous ossification are irregular bones. 2. An osteon contains osteocytes, lamellae, and a central canal, and is found in compact bone only. 3. The trabeculae of spongy bone are oriented toward lines of stress. 4. Each consecutive bone lamella has collagen fibers that wrap in alternating directions. 5. Cartilage has a flexible matrix that can accommodate mitosis of chondrocytes.
The condition known as goiter can result from too
A) much insulin. B) little TSH. C) much ACTH. D) little iodine in the diet. E) little glucagon.
When the carbonic acid-sodium bicarbonate buffer pair buffer an acid:
a. water is an end product b. carbonic anhydrase reacts with the carbonic acid c. more sodium bicarbonate is formed d. more carbonic acid is formed