Describe the catecholamines. Give one example. Describe steroid hormones. Give one example. How are they different in their action and why?

Visit this link (http://openstaxcollege.org/l/roleofhypo) to watch an animation showing the role of the hypothalamus and the pituitary gland. Which hormone is released by the pituitary to stimulate the thyroid gland?

Distinguish among hormones, neurotransmitters, local signaling molecules, and pheromones.

A cell secretes a product that diffuses through the interstitial fluid and acts on nearby cells. This process is an example of (a) neuroendocrine secretion (b) autocrine signaling (c) paracrine signaling (d) classical endocrine regulation (e) peptide hormone function

Researchers measured prolactin and growth hormone in the blood plasma of six subjects at regular intervals over a 24-hour period. The investigators were interested in determining if the levels of these two hormones cycle over a 24-hour period. The Figure presents the results of their experiments, with the y axis values showing the amount of each hormone expressed as a percentage of the 24-hour mean value, and each point showing the average of the six subjects levels. FIGURE Mean concentrations of prolactin and growth hormone in plasma, averaged for six subjects and expressed as a percentage of the average concentrations measured for the 24-hour period. Do the results support the hypothesis that the changes in prolactin level over a 24-hour period are associated with the sleepwake cycle? Source: From J. F. Sassin et al. 1972. Human prolactin: 24-hour pattern with increased release during sleep. Science 177:12051207.

How do hormones compare structurally and functionally in invertebrates and vertebrates?

__________ are molecules released from a signaling cell that have effects on target cells. a. Hormones b. Neurotransmitters c. Local signaling molecules d. Pheromones e. a and b f. all of the above

A scientist hypothesizes that the pancreas’s hormone production is controlled by neural stimuli. Which observation would support this hypothesis? Insulin is produced in response to sudden stress without a rise in blood glucose Insulin is produced in response to a rise in glucagon levels Beta cells express epinephrine receptors Insulin is produced in response to a rise in blood glucose in the brain.

A new antagonist molecule has been discovered that binds to and blocks plasma membrane receptors. What effect will this antagonist have on testosterone, a steroid hormone? It will block testosterone from binding to its receptor It will block testosterone from activating cAMP signaling It will increase testosterone-mediated signaling It will not affect testosterone-mediated signaling.

List the steps involved in transmitting a nerve impulse from one neuron to another.