1 Isotonic -a muscle fiber contraction in which force production is unchanged when the muscle contracts causing movement of an external load.  Isokinetic -a muscle fiber contraction in which force production of the contraction is sufficient to overcome the external load.
HIV/AIDS. HIV Risk Behaviors. The risk of getting HIV varies widely depending on the type of exposure or behavior (such as sharing needles or having sex without a condom). Some exposures to HIV carry a much higher risk of transmission than other exposures.
Oral sex (mouth-penis, mouth-vagina): There are cases where HIV was transmitted orally, so it's not completely without risk to have HIV-infected semen, vaginal fluid or blood in your mouth. However, oral sex is considered a low risk practice.