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【单选题】
What is wrong in the following statements about blood transport O2（ ）
A.
The main form of transport is physical dissolution
B.
The binding of hemoglobin to O2 is reversible
C.
The main form of transport is chemical combination
D.
Low PO2 promote the dissociation of hemoglobin and O2
E.
PO2 is high and promotes the binding of hemoglobin to O2
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举一反三
【单选题】The following is/are synthesized and secreted by beta (b) cells (also referred to as B cells) within the islets of Langerhans of the endocrine pancreas:（ ）
A.
C-peptide
B.
Insulin
C.
Pancreatic polypeptide
D.
Glucagon
E.
Amylin
【多选题】Plasma proteins are mainly（ ）
A.
Fibrinogen
B.
Hemoglobin
C.
Thrombin regulatory protein
D.
Albumin
E.
Globulin
【多选题】Factors that can increase stroke output are（ ）
A.
Lower arterial blood pressure
B.
Increased myocardial contractility
C.
Elevated arterial blood pressure
D.
Increased end-diastolic ventricular volume
E.
Increased myocardial excitability
【单选题】Single strand DNA 5’-CGGTA-3’ can anneal with the follow RNA _____（ ）
A.
5’-GCCAU-3’
B.
5’-TAGGC-3’
C.
5’-GCCAT-3’
D.
5’-UACCG-3’
【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.
【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