What chemical ion is responsible for initiating the contraction of a muscle fiber?

The process of osmosis would explain the net movement of water into a cell if the percent of

Which of the following is correctly paired with its function? a) sensory somatic nervous system-controls skeletal muscles b) autonomic nervous system - creates voluntary response to stimuli c) parasympathetic nervous system - controls body response

Darwins concept of evolution was not influenced by

The skin is richly supplied with arteriovenous anastomoses in which blood flows directly between an artery and a vein, bypassing the capillary circulation. What is the primary significance of these structures?

Which reaction is exothermic? a reaction that absorbs energy from the environment a reaction that requires an activation energy a reaction that releases energy into the environment a reaction that does not involve a change in energy

8. Which is a characteristic of exponential growth?

A population contains short plants and tall plants. The short plants are not able to compete with tall plants for sunlight. The tall plants, however, are more susceptible to wind damage.

Sugars, starches, and dietary fibers are examples of

Put the following stages of life in the proper order from youngest in age to oldest in age.

What only acts in the digestion of carbohydrates