The respiratory system depends on the nervous system for signals to
a. coordinate the muscles that control breathing.
b. exchange gases with the circulatory system.
c. enhance the amount of available oxygen in the lungs.
d. release enzymes to increase the exchange of gase

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra

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.

Why is a mushroom considered a heterotroph