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【单选题】
The concentration of hormones in the blood is extremely low, but the physiological effects are very obvious because（ ）
A.
Hormones are distributed throughout the body along with the blood
B.
high specificity of hormone
C.
Hormones have very long half-lives
D.
There is a highly efficient bioamplification system in cells
E.
Long duration of hormone secretion
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举一反三
【单选题】All the following shift the oxyhemoglobin dissociation curve to the right except: （ ）
A.
An increase in PCO2
B.
An increase in PCO
C.
Increase in 2, 3-DPG
D.
An increase in the concentration of H+ in blood
E.
An increase in temperature
【单选题】Which can measure cardiomyocyte autorhythmicity（ ）
A.
The level of threshold potential
B.
Maximum repolarization potential level
C.
Amplitude of the action potential
D.
Rate of depolarization in phase 0
E.
Rate of automatic depolarization in phase 4
【多选题】Belongs to the internal environment is（ ）
A.
Urine
B.
Cerebrospinal fluid
C.
Plasma
D.
Lymph
E.
Interstitial fluid
【单选题】Which is correct about the following description of ADH（ ）
A.
When the osmotic pressure of plasma crystal increases, its release volume decreases
B.
Synthesized and secreted by the neurohypophysis
C.
When arterial blood pressure decreases, its release volume increases
D.
When circulating blood volume increases, its release volume increases
E.
Improve water reabsorption by proximal tubules
【单选题】In the depolarization phase of nerve cell action potential Na+ transport belongs to（ ）
A.
Primary active transport
B.
Secondary active transport
C.
Exocytosis
D.
Facilited diffusion
E.
Simple diffusion
【单选题】The final road of somatic motor reflex refers to（ ）
A.
β neurons in the anterior horn of the spinal cord
B.
γ neurons in the anterior horn of spinal cord
C.
Spindle external muscle fibers
D.
motor neurons in the cerebral cortex
E.
α neurons in the anterior horn of the spinal cord
【单选题】The mechanism of glucose absorption in the small intestine is （ ）
A.
Simple diffusion
B.
Simple diffusion
C.
Endocytosis
D.
Active transshipment
E.
Penetration
【多选题】The statement about nearsightedness is correct（ ）
A.
It can be corrected with cylindrical mirror
B.
Suitable concave lens can be worn for correction
C.
Most of them are caused by excessive length of anterior and posterior diameter of the eyeball
D.
Far point is closer than the eye
E.
Near point is farther than emmetropia
【多选题】Which is incorrect The following statement about plasma（ ）
A.
The main components of plasma are crystalline substance and plasma proteins
B.
Plasma is the liquid separated from coagulated blood
C.
Plasma contains fibrinogen
D.
The protein content in plasma is significantly higher than that in tissue fluid
E.
Plasma is free of Ca2+ and other electrolytes
【单选题】What does not belong to the function of growth hormone is（ ）
A.
Promote protein synthesis
B.
Increase blood sugar level
C.
Promote the growth and development of cartilage
D.
Promote brain cell growth and development
E.
Promote fat storage