Which is wrong about intrapleural pressure? []
A. It is equal to the difference between the intrapulmonary pressure and the lung retraction pressure
B. It is always lower than the atmospheric pressure
C. It can be expressed indirectly by the pressure of the esophagus
D. It is beneficial to maintaining the expanded state of the lung
E. It is beneficial to the return of venous blood
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The main component of bile involved in digestion and absorption is []
A. Digestive enzymes
Bile salt
C. Lecithin
D. Bile pigment
E. Fatty acids
The absorption mechanism of most water-soluble vitamins is []
A. osmosis
B. Active transport
C. endocytosis
D. Simple diffusion
E. Facilitated diffusion
The main absorption site of vitamin B12 is []
A. Stomach
B. Duodenum
C. Jejunum
D. Ileum
E. Colon
The slow wave of gastrointestinal smooth muscle originates from []
A. Mucosal layer
B. Serous membrane layer
Circulatory muscle
D. Longitudinal muscle
E. Cajal interstitial cells
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