Which of the following best describes the process by which glucose can be formed from amino acids?( )
A. Gluconeogenesis
B. Glycogenesis
C. Glycogenolysis
D. Glycolysis
E. Hydrolysis
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Men who take large doses of testosterone-like androgenic steroids for long periods are sterile in the reproductive sense of the word. What is the explanation for this finding?( )
A. High levels of androgens bind to testosterone receptors in the Sertoli cells, resulting in overstimulation of inhibin formation.
B. Overstimulation of sperm cell production results in the formation of defective sperm cells.
C. High levels of androgen compounds inhibit the secretion of gonadotropin-releasing hormone by the hypothalamus, resulting in the inhibition of luteinizing hormone and follicle-stimulating hormone release by the anterior pituitary.
D. High levels of androgen compounds produce hypertrophic dysfunction of the prostate gland.
E. High levels of androgens bind to testosterone receptors in the Leydig cells, resulting in overstimulation of inhibin formation.
下列属于负反馈调节的是()
A. 减压反射
B. 血液凝固过程
C. 分娩过程
D. 排尿反射
E. 动作电位去极化
细胞外液的K+浓度明显降低时,将引起神经细胞()
A. 膜电位负值减小
B. 膜的K+电导增大
C. 钠泵活动增强
D. K+平衡电位负值减小
E. Na+内流的驱动力增大
神经细胞膜上Na+的跨膜转运方式是()
A. 单纯扩散
B. 易化扩散
C. 主动转运
D. 易化扩散和主动转运
E. 单纯扩散和主动转运
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