If a dog starts to put its paw down on a sharp stone, the tough skin skin protects underlying structures from damage. additionally, touch receptors in the skin send sensory signals to the spinal cord. the spinal cord then sends a signal to the muscles to lift the paw rather than continuing to press down. in this scenario, the dog may experience discomfort but avoid injury. what two body systems are being used to protect the structures beneath the dog's skin and signal the muscles to lift the paw?

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition.b) one-fourth of the daughters of an affected man would have this condition.c) one-half of the daughters of an affected father and a carrier mother could have this condition.d) only if a woman is xxx could she have this condition.