Author Question: What are the primary functions of the respiratory system? ... (Read 104 times)

hubes95 · **on:** Feb 28, 2019

What are the primary functions of the respiratory system?

Question 2

The following steps occur in rods when they are excited by photons of light. What is the proper sequence for these steps? 1. Membrane sodium channels close. 2. Increased phosphodiesterase breaks down cGMP. 3. Retinal changes from the 11-cis form to the 11-trans form. 4. The membrane hyperpolarizes and the rate of neurotransmitter release declines. 5. Opsin activates transducin. 6. Opsin activation occurs.
A) 1, 6, 5, 2, 4, 3
B) 3, 6, 5, 2, 1, 4
C) 6, 3, 5, 2, 1, 4
D) 3, 6, 5, 1, 2, 4
E) 1, 3, 4, 5, 6, 2

Beatricemm · **Reply #1 on:** Feb 28, 2019

Answer to Question 1

(1 ) Provide an extensive area for gas exchange between inhaled air and the circulation; (2 ) move air to and from the exchange surfaces of the lungs; (3 ) protect the respiratory surfaces from dehydration, temperature changes, and other environmental variations and defend the respiratory system and other tissues from invasion by pathogens; (4 ) produce sounds involved in speaking, singing, or nonverbal auditory communication; (5 ) direct incoming air to the olfactory epithelium in support of olfaction; (6 ) indirectly contribute to regulation of blood volume, blood pressure, and pH.

Answer to Question 2

B