What does "D" represent on the diagram?
A. Myosin myofilament
B. Sarcomere
C. Cross-bridge
D. Actin myofilament
E. Z disk
Answer: E
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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?
Which component of the reflex arc directly sends an impulse to an organ making a response?
a. receptor b. afferent pathway c. integrating center d. efferent pathway e. effector
Protein digestion is initiated by salivary amylase
Indicate whether the statement is true or false
Irreversible changes in the shape of a protein result from
A. extreme heat and pH. B. the presence of catalysts. C. steroid action. D. freezing temperatures and changes in air pressure.