Sympathetic nerve fibers trigger the secretion of nitric oxide,which dilates the deep arteries allowing blood to engorge the penis.
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Q13: At early puberty,follicle stimulating hormone (FSH)and luteinizing
Q14: Which of the following is a secondary
Q15: Myotonia of skeletal muscles is characteristic of
Q16: Only germ cells undergo meiosis,which produces four
Q17: Sperm make up just 10% of semen
Q19: Erectile dysfunction prevents ejaculation in most cases.
Q20: The mechanism that keeps the testes cooler
Q21: Whether an organism will be genetically male
Q22: The penis is homologous to the _.
A)
Q23: When it is cold,the _ contracts and
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