Post 4 Defense Barrier The first line of defense (or outside defense system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection . These include your skin, tears, mucus, cilia, stomach acid, urine flow, ‘friendly’ bacteria and white blood cells called neutrophils . Pathogenic (disease-causing) microorganisms must make it past this first line of defense...
Post 3 Reproductive System Definition of reproductive system : the system of organs and parts which function in reproduction consisting in the male especially of the testes, penis, seminal vesicles, prostate, and urethra and in the female especially of the ovaries, fallopian tubes, uterus, vagina, and vulva
Comentarios
Publicar un comentario