Smooth muscle cells are contractile and will contract from many different agents such as hormones travelling in the blood and neurotransmitters from the autonomic nervous system. The smooth muscle cells are coupled together so that when one cell contracts, the contraction is relayed to the next. This contractile ability is important in the vascular system as it helps regulate blood pressure by changing the size of the lumen of the vessel.
<span>This contractile feature also enables the movement of food through the digestive tract. Rhythmic contractions of smooth muscle cells, called peristalsis, moves the food along.
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In order for a hurricane to form, a temperature of 80 degrees Fahrenheit is needed
areas close the equator provide this ideal temperature for the formation of hurricanes
Diffusion vs. Active Transport: molecules move across cell membranes by two major processes diffusion or active transport. Diffusion is the movement from a high concentration of molecules to a low concentration of molecules. ... Moving molecules with cell energy is called active transport
Answer: B
Explanation: I think the answer is B because natural selection leads to evolution because they happen in a line or like a chain reaction.
