Which muscle(s) contract(s) during forced expiration?
A. Pectoralis minor
B. External intercostals
C. Sternocleidomastoid
D. Diaphragm
E. Rectus abdominis
Answer: E
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The myosin in smooth muscle cells differs from that in skeletal muscle in that smooth muscle myosin requires phosphorylation before it can bind to actin.
Answer the following statement true (T) or false (F)
The lungs can be found in which cavity?
A. Mediastinum B. Spinal cavity C. Pleural cavity D. Abdominal cavity
The mass number represents the number of
A) protons in an atom. B) electrons in an ion. C) neutrons in an atom. D) protons and neutrons in an atom. E) neutrons and electrons in an atom.
If the pulmonary ventilation rate is 3200 ml/minute with a tidal volume of 400, the respiratory rate is ____ breaths per minute
a. 6 b. 8 c. 14 d. 16 e. 20