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.
It begins with an exposureâ¦. The journey begins with an exposure. For an HIV exposure to pose a risk of infection, specific bodily fluids from an HIV-positive person need to come into contact with specific body parts of an HIV-negative person. This can happen during anal, vaginal or oral sex.