Match the following terms and definitions.
1. a fluid of lymph and blood that circulates within invertebrates
interferons
lymphocyte
nephron
2. protein cells that assist in fighting infection and disease
type of leukocyte that makes up the specific immunity
system; capable of building immunity to a disease
excretory tubules in insects and spiders that empty into the
intestine
malpighian tubules
5. the functioning unit of the kidney that produces urine
nephridia
6. tubes in flatworms and earthworms that excrete waste
hemolymph

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.