Science test 1. how do some hormones affect only certain cells in the body but not others? only cells having specific receptors for a hormone can respond to the hormone's presence. the hormones only go to some cells in the body but not to others. special molecules on cells that are not affected break down the hormone before the cell can recognize it. some cells have the wrong temperature to respond to the hormone. 2. which of these is not a layer of the skin? dermis epidermis hypodermis hyperdermis 3. if the heart becomes damaged or weakened, how will this affect the body’s systems? the muscular system will strengthen the heart. only the nervous system will be unable to function. the circulatory system will not function well, which will affect all other body systems. only the circulatory and respiratory systems will be affected.