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【单选题】

When cells are stimulated and excited, the absolute value of the membrane potential decreases, which is called( )

A.
Repolarization
B.
Reverse polarization
C.
polarization
D.
Depolarization
E.
Hyperpolarization
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【单选题】The basis of controlling the contractile rhythm of digestive smooth muscle is( )

A.
Slow wave
B.
Action potential
C.
Intramural plexus activity
D.
Sympathetic excitation
E.
Vagus nerve excitation

【单选题】Which of the following lists includes only structures that compose the anatomic dead-space?( )

A.
Capillaries, respiratory bronchioles, alveolar ducts, alveoli
B.
Pharynx, bronchi, alveolar ducts, larynx
C.
Pharynx, nasal cavity, trachea, bronchi
D.
Respiratory bronchioles, alveoli, trachea, nasal cavity
E.
Capillaries, respiratory bronchioles, trachea, bronchi

【单选题】The body's main mode of regulation( )

A.
Positive feedback regulation
B.
Neuromodulation
C.
Humoral regulation
D.
Self-regulation
E.
Negative feedback regulation

【单选题】The accelerated erythrocyte sedimentation rate was caused by( )

A.
Haematocytosis
B.
Swelling of red blood cells
C.
Shrinkage of red blood cells
D.
Rupture of red blood cells
E.
Erythrocyte agglutination

【单选题】The physiologic function of the relatively slow conduction through the atrioventricular node is to allow sufficient time for( )

A.
Repolarization of the ventricles
B.
Venous return to the atria
C.
Contraction of the ventricles
D.
Runoff of blood from the aorta to the arteries
E.
Filling of the ventricles

【单选题】Name the structure of the nephron that reabsorbs the most substances.( )

A.
Collecting duct
B.
Distal convoluted tubule
C.
Proximal convoluted tubule
D.
Glomerular capsule
E.
Loop of Henle

【单选题】The main components of nerve cell action potential are( )

A.
Negative after-potential
B.
Local potential
C.
Positive after-potential
D.
Peak potential
E.
Threshold potential

【单选题】In the refraction system of the eye, the interface with the greatest refraction ability is( )

A.
Vitreo-retinal interface
B.
Posterior corneal surface -- aqueous humor
C.
Air -- anterior surface of cornea
D.
Posterior surface of lens -- vitreous body
E.
Aqueous humor -- anterior lens surface