450 likes | 725 Vues
Bacteria:. Bacteria are: Prokaryotes. no membrane bound organelles Like nucleus, chloroplasts or mitochondria. Bacteria:. Genetic material floats around in the cytoplasm Movement possible with structures called: flagella, or cilia. Bacteria:.
E N D
Bacteria are: Prokaryotes • no membrane bound organelles • Like nucleus, chloroplasts or mitochondria
Bacteria: Genetic material floats around in the cytoplasm Movement possible with structures called: flagella, or cilia
Bacteria: • two kingdoms of bacteria • Archaebacteria : • harsh environments, • harsh environments, • create endospores • thick walled cell • Oldest organisms,
Eubacteria • All the same characteristics of Archaebacteria except living in harsh environments
Cell Structure: • 3 general shapes: rod-like , spherical, spiral
Reproduce asexually • by binary fission
Sexual reproduction: • Some can reproduce sexually by conjugation • (2 organisms get together and exchange genetic material)
Can be an autotroph or Heterotroph Play positive role in society: Fuel production Food production Medicines Environmental recycling . Bacteria
Bacteria • .Causes many infectious diseases • .Can be treated successfully with antibiotics
Staphylococcus aureus, the most prevalent pathogen of humans, may cause up to one third of all bacterial diseases ranging from boils and pimples to food poisoning
STD’s Most STD’s ( sexually transmitted diseases) are bacterial
What is Chlamydia? • Chlamydia is a common (STD) • caused by the bacterium, Chlamydia trachomatis, • which can damage a woman's reproductive organs. • symptoms of Chlamydia are usually mild or absent, serious complications that cause irreversible damage, including infertility, can occur "silently" before a woman ever recognizes a problem.
Syphilis Spirochetes on Head of Sperm
Viruses Dead or alive?
Viral structure • Viruses are not cells. • Basic structure: • Protein coat • Nucleic acid core (RNA or DNA) • Lipoprotein coat • (second coat – only in enveloped viruses)
Are viruses alive? • Only 1 characteristic of life: reproduction • Can only reproduce inside a host cell!
Human papilloma virus (HPV) is one of the most common (STDs). Sexually Transmitted Diseases What is human papilloma virus (HPV)?
HPV: • HPV is estimated to be the most common sexually transmitted infection in the US • Most sexually active men and women will probably acquire genital HPV infection at some point in their lives. • The American Social Health Association reported estimates that about 75-80% of sexually active Americans will be infected with HPV at some point in their lifetime.
HPV: • can be spread through skin-to-skin contact. • many different types of HPV. • Some types cause genital warts & are called low-risk, • some types can lead to cervical cancer and are called high-risk. • There is no known cure for HPV, • there is a vaccine that can protect against some types of the virus.
condoms may not protect sexual partners from contracting genital HPV infections!!!! WHY????
Herpes • Herpes, whether genital herpes or cold sores (fever blisters) are caused by an infection with the herpes simplex virus. • Genital herpes, for example, affects more than one in five adolescents and adults • With genital herpes, tender ulcers will generally appear around the genitals or rectum.
Herpes Cont. • The herpes virus can be spread by direct contact with the sore or indirect contact through sharing items such as utensils, towels, or drinks.
HIV • Infection occurs by the transfer of blood, semen, vaginal fluid, pre-ejaculate, or breast milk, bodily fluids, • HIV is present as both free virus particles and virus within infected immune cells. • The 4 routes of transmission are unprotected sexual intercourse, contaminated needles, breast milk, and transmission from an infectedmother toher baby at birth
Immune System Terminology: • Pathogen – organism which causes the disease • Toxin – poison that travels through the body interfering with normal processes • antibodies – molecules that fit to an invading foreign body signally WBC’s for destruction
The Immune System Purpose: to remove infectious diseases and other pathogens from the human body
Immune System Major Organs and Their Functions • 1st line of Defense: Skin – also called the Integumentary system, acts as a barrier • 2nd line of Defense: Mucous and Chemicals traps or kills the pathogen • 3rd line of Defense: White Blood Cells – recognize disease agents (antigens- marker) and create antibodies ( to tag and remove these antigens
WBC’s Cont. • Part of your blood • Made of many types • Phagocytes are the WBC type that actually eats and destroys these antigens • Ex. macrophage
Lymph Nodes Lymph Nodes – help restore fluid lost by the blood and return it to the circulatory system