The concentration of sodium and potassium ions inside and outside a nerve cell must be reset each time the transition of a nerve impulse occurs. both ion types are able to move across the nerve cell membrane against the concentration gradient. To maintain these gradients, nerve cells depend directly on the chemical output of which other cell process. mitosis
replication
respiration
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The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Complete the sentences by matching the names of trees to the appropriate blanks. to do this, drag the names on the left into the appropriate blanks in the sentences on the right. match the words in the left column to the appropriate blanks in the sentences on the right. terms may be used more than once. make certain you have filled every blank with a term before clicking submit. 1. deciduous trees lose their leaves seasonally and include trees such as maple and elm. 2. conifer leaves are generally thin and needle-like, while seeds are contained in cones. conifers include cedar and pine. 3. evergreens are plants that maintain their leaves in all seasons and include trees such as cedar, elm, and pine. 4. hardwoods reproduce using flowers and have broad leaves; hardwoods include trees such as maple, , and cedar. elm returned you filled in 2 of 10 blanks incorrectly. mango trees are tropical broad leaf plants that maintain their leaves all year long. no credit lost. try again.

Name the types of burns one can get and which structures of the integument are damaged