The AV node controls the basic rhythm of the heart, so it is called the pacemaker, but the SA node can modify heart rate when necessary.
Answer the following statement true (T) or false (F)
False
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Airway passages have smooth muscle cells that are unique in that they have two receptor sites on their outer membrane. One receptor site accepts ACh as the neurotransmitter. When excited it causes the smooth muscle to contract. The second site accepts NE and the inhibitory effect is that the ACh dilates the airway.
What will be an ideal response?
What is the substance in tea that binds iron, reducing the amount absorbed?
A) Tannic acid B) Ascorbic acid C) Caffeine D) Folic acid
Glycoproteins are protein molecules with molecules of glycogen attached to the amino acid side chains.
Answer the following statement true (T) or false (F)
Which function would stop immediately if the ribosomes of a cell were destroyed?
A. ATP synthesis B. DNA replication C. Protein synthesis D. Osmosis E. Active transport