During  _______ both rods and cones are simultaneously stimulated causing large amounts of visual pigment to be instantaneously broken down. Visual acuity does improve quickly, in about 5-10 minutes, once retinal sensitivity decreases as the rod system is shut down. 

Compare and contrast lipid-soluble hormones and water-soluble hormones. To receive full credit the discussion needs to include three of the following aspects: source, how the hormone is transported in the blood, the half-life in the blood, location of hormone receptors on the target cell, or mechanism of action at the target cell.            

 What hormone is a strong stimulant for uterine contraction during childbirth and acts to trigger milk ejection? 

Vision is maintained because the outer segment of photoreceptors is renewed every 24 hours. 

_______ are the long-distance chemical signals used by the endocrine system which can travel through either the blood or the  _______ to target cells. 

What is the correct order of events in the formation and breakdown of rhodopsin? 

What common complication of diabetes mellitus causes damage to the autonomic nerves? Early signs can be sexual dysfunction, with other frequent symptoms including dizziness after suddenly standing up, urinary incontinence, sluggish eye pupil reactions, and impaired sweating. 

An example of hormonal stimulation to the endocrine system is when the pancreas releases insulin in direct response to blood glucose concentration. 

From the list below, what are the two major neurotransmitters used in the autonomic nervous system? (choose all that apply) 

From the list below, what are the two main secondary messenger systems used by water-soluble hormones? (choose all that apply)