If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells a. it would be much longer before cardiac cells could respond to a second stimulation b. tetanic contractions might occur, which would stop the heart's pumping action c. contractions would last as long as the refractory period d. it would be less than 1-2 milliseconds

If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells tetanic contractions might occur, which would stop the heart's pumping action.-B.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.