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【单选题】
Which is not a feature of enhancer？（ ）
A.
It can enhance the promoter in any direction and at any location
B.
A gene often has only one enhancer.
C.
The distance between enhancer sequences and regulated genes varies a lot.
D.
Sometimes enhancer sequences can also be located within introns.
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举一反三
【单选题】The main reason for decreased urine output during heavy sweating is（ ）
A.
Sympathetic excitation causes ADH secretion
B.
Reduced osmotic pressure of plasma crystal leads to ADH secretion
C.
Increased osmotic pressure of plasma crystal leads to ADH secretion
D.
Decreased blood volume, resulting in reduced glomerular filtration rate
E.
Increased plasma colloid osmotic pressure, resulting in decreased glomerular filtration rate
【多选题】Statements about the resting potential of nerve fibers are correct（ ）
A.
It is a relative stable potential
B.
Its magnitude is close to K+ equilibrium potential
C.
Its value is close to Na+ equilibrium potential
D.
It is negative outside the membrane and positive inside the membrane
E.
It is positive outside the membrane and negative inside the membrane
【多选题】Endogenous substances that stimulate gastric secretion include（ ）
A.
Histamine
B.
γ-aminobutyric acid
C.
Gastrin
D.
Norepinephrine
E.
Acetylcholine
【单选题】The effect of glucocorticoids on glucose metabolism is that（ ）
A.
It increase the absorption of glucose in the small intestine
B.
It promotes gluconeogenesis, inhibits glucose consumption and increases blood sugar
C.
It does not affect the gluconeogenesis process, but inhibits the use of glucose and increases blood glucose
D.
It promote gluconeogenesis without affecting glucose utilization and blood glucose level
E.
It inhibits gluconeogenesis, promotes glucose consumption and decreases blood sugar
【单选题】The cerebral cortex representative areas of body movement are mainly distributed in（ ）
A.
The temporal lobe
B.
Anterior central gyrus
C.
Limbic cortex
D.
Posterior central gyrus
E.
The occipital lobe
【多选题】Which are incorrect in the following statements about blood coagulation（ ）
A.
FactorⅡis the initiating factor of blood coagulation
B.
Tissue factor (TFⅢ) is indispensable for blood coagulation
C.
The activation of various factors during blood coagulation is a positive feedback process
D.
All 12 factors involved in blood coagulation are synthesized by the liver
E.
All 12 factors involved in blood coagulation are proteins
【单选题】The excitatory effect of hypoxia on respiration is via（ ）
A.
Direct stimulation of the respiratory center
B.
Direct excitation of inspiratory neurons in the medulla oblongata
C.
Direct stimulation of the pons respiratory regulation center
D.
Stimulate the central chemoreceptor and stimulate the respiratory center
E.
Reflexive effects achieved by peripheral chemoreceptors
【单选题】The main cause of oliguria caused by injection of norepinephrine is（ ）
A.
Elevated plasma colloid osmotic pressure
B.
The permeability of filtration membrane is reduced
C.
Increased intracapsular pressure
D.
Increased secretion of vasopressin
E.
The glomerular capillary blood pressure was significantly reduced
【多选题】Currents caused by the opening of which of the following channels contribute to the repolarization phase of the action potential of ventricular muscle fibers?（ ）
A.
HCO3- channels
B.
K+ channels
C.
Ca2+ channels
D.
Na+ channels
E.
Cl- channels