In Type 2 diabetes, insulin levels are frequently normal, yet the target cells are less sensitive to the effects of insulin. This suggests that the target cells (a) are impermeable to insulin, (b) may lack enough insulin receptors, (c) cannot convert insulin to an active form, (d) have adequate internal supplies of glucose, (e) both b and c.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. The cells of the nervous system communicate via action potentials, whereas the cells of the endocrine system communicate via hormones.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Steroid hormones are hydrophilic molecules that bind to plasma membrane proteins as part of a second-messenger system.