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Reproductive System Yatziri Carmona Per.1 (STI's (Chlamydia…

- - - - scrotum: where the testes are
        
        accessory sex glands: empty their secretions into the ducts during ejaculation
        
        ducts:The ejaculatory ducts carry sperm from the vas deferens, as well as secretions from the seminal vesicles and prostate gland that together form semen
        
        penis:a male erectile organ of copulation by which urine and semen are discharged from the body and that develops from the same embryonic mass of tissue as the clitoris
  - - - under parasympathetic control
        
        Erection, enlargement and stiffening of the penis, results from engorgement of the erectile bodies with blood. When a man is not sexually aroused, arterioles supplying the erectile tissue are constricted and the penis is flaccid. However, sexual excitement triggers a parasympathetic reflex that promotes release of nitric oxidelocally. NO relaxes smooth muscle in the penile blood vessel walls, dilating these arterioles,* and the erectile bodies fill with blood. Expansion of the corpora cavernosa of the penis compresses their drainage veins, retarding blood outflow and maintaining engorgement.
    - - under sympathetic control
        
        The ductus deferens, prostate, and seminal glands contract, emptying their contents into the prostatic urethra. At the same time, the bladder internal sphincter muscle constricts, preventing expulsion of urine or reflux of semen into the bladder.
        
        Semen in the urethra triggers a spinal reflex through somatic motor neurons. The bulbospongiosus muscles of the penis undergo a rapid series of contractions, propelling semen from the urethra. These rhythmic contractions are accompanied by intense pleasure (orgasm, or climax) and many systemic changes, such as generalized muscle contraction, rapid heartbeat, and elevated blood pressure.
        
        Ejaculation is the propulsion of semen from the male duct system. When impulses provoking erection reach a critical level, a spinal reflex is initiated, and a massive discharge of nerve impulses occurs over the sympathetic nerves serving the genital organs. As a result:
- - - - vagina:Thin-walled tube extending from the cervix to the body exterior; often called the birth canal.
        
        external genitalia:the labia majora, mons pubis, labia minora, clitoris, and glands within the vestibule
        
        internal genitalia:her ovaries and duct system—are mostly located in the pelvic cavity
        
        the female’s accessory ducts, from the vicinity of the ovary to the body exterior, are the uterine tubes, the uterus, and the vagina. They transport or otherwise serve the needs of the reproductive cells and a developing fetus