The organs forming the male duct system as listed from the male gonad to the body exterior are;
Epididymis = Vas deferens = Urethra
Epididymis is a tube located at the back of the testicles that stores and carries sperm. Vas deferens transports sperm from the epididymis to the ejaculatory ducts in anticipation of ejaculation. The urethra carries urine from the bladder to outside of the body. Additionally, it has function of ejaculating semen when the man reaches orgasm.
Two bacterial foodborne diseases is the infective dose thought to be very low are E. coli 0157:H7 and listeriosis.
- Escherichia coli (abbreviated as E. coli) are bacteria found in the environment, foods, and intestines of people and animals. E. coli are a large and diverse group of bacteria. Although most strains of E. coli are harmless, others can make you sick.
- Listeriosis is a potentially fatal sickness caused by consuming food infected with the bacteria Listeria monocytogenes. Each year, an estimated 1,600 people contract listeriosis, with approximately 260 dying. Listeria monocytogenes (L. monocytogenes) is a pathogenic (disease-causing) bacterium found in wet habitats, soil, water, decaying vegetation, and animals, and it may survive and even thrive under refrigeration and other food preservation procedures.
To learn more about E. coli 0157:H7 and listeriosis.
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<span>The avian heart has evolved into a large and powerful organ with rapid muscular contractions. Generally the smaller the species the larger the relative heart size. Generally birds have hearts larger and ones that beat faster than mammals. The human heart weight amounts to .42 percent of body weight and the pulse rate at rest averages 72 beats per minute. The House Sparrow's heart constitutes 1.68 percent of the body weight and the pulse rate at rest averages 460 beats per minute. In the Ruby-throated Hummingbird these figures rise to 2.37 percent and a pulse rate of 615.</span>
