When you start to exercise, the body responds in various ways due to internal stimuli. One response is an increase in heart rate. Identify a stimulus that would cause an increase in heart rate.

Which cell junction (not shown) allows direct passage from one cell's cytoplasm to the next?

Why is there a trade-off between survivorship and fecundity?

What are the smallest building blocks of life?

What is the source of the carbon atoms in glucose molecule?

Assume that several thousand presynaptic neurons synapse with a single postsynaptic neuron. The various presynaptic neurons release ten different neurotransmitters, which are bound by specific (and varying) receptors on the postsynaptic neuron.

Which function of the nephron includes the movement of fluid from the blood into bowman's capsule?

Which one of the following is true for a theory? A) Explanation supported by experiments B) Widely accepted as true C) Supported by repeatable results D) All of the choices

Which of the following is the largest contributor to the salt ions in the ocean? sodium chloride sulfates calcium

Your body moves food thourgh the digestive tract by using a. smooth muscle b. cardiac muscle c. extensor muscle d. Flexor muscle

A group of organs that work together to perform a major function is called a (n)