Examlex
Which of the following bar charts shows the correct internal energy changes that occur when a propane grill is used to cook a steak? (Consider the propane combustion reaction to be the system. Consider the grill, steak, and everything else to be the surroundings.)
Neurons
The fundamental cells of the brain and nervous system responsible for receiving sensory input from the external world, transmitting this input, and sending motor commands to muscles.
Endocrine System
A network of glands in the body that secrete hormones into the bloodstream to regulate various body functions such as growth, metabolism, and mood.
Pineal Gland
A tiny gland in the brain responsible for making melatonin, which is a hormone that controls the sleep-wake rhythm.
Interneurons
Neurons responsible for sending signals between other neurons, particularly within a reflex arc of the central nervous system.
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