The number 3 correctly covers all of the following exept... A. Named layers of t

Question

The number 3 correctly covers all of the following exept...

A. Named layers of the cortex of the adrenal gland

B. Major regional subparts of the thyroid gland

C. Endocrine products of the small intestine

D. Iodine atoms in the chemical structure of thyroxine

E. Physiologically active endocrine products of the thyroid gland

#2-- Which item is FALSE?

A. although regular cardiac muscle cells have inherent rhythmicity in regard to depolarization/repolarization, heart rate is controlled by specialized cardiac muscle cells called purkinje fibers which have a shorter periodicity

B. heart rate is set by a group of purkinje fibers in the wall of the right atrium called the sinoatrial (SA) node

C. a second group of purkinje fibers at the top of the interventricular septum called the atrioventricular (A V) node delays the passage of the impulse initiating contraction by .12-2.0 sec. (at resting heart rates) to allow the atria time to complete their contraction before the ventricles contract

D. excessiv delay of the contractile impulse at the AV node is called first degree heart block, and if some of the impulses fail to reach the ventricles, the diagosis is second degree heart block

E. complete blockage of impulses at the AV node is called total (complete, third degree) heart block.

Explanation / Answer

1). The number 3 correctly covers all of the following exept...

A. Named layers of the cortex of the adrenal gland - Three (the three layers are, zona glomerulosa, Zona fasciculata, and zona reticularis)

B. Major regional subparts of the thyroid gland - Three

C. Endocrine products of the small intestine - Three

D. Iodine atoms in the chemical structure of thyroxine - Four (thyroxine contains four iodine atoms (T4), wehreas the triiodothyronine contains three iodine atoms), so, it is an exception for the "3" rule

E. Physiologically active endocrine products of the thyroid gland - Three

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