PSL201Y1 Chapter Notes -Basal Metabolic Rate, Sympathetic Nervous System, Gluconeogenesis
Document Summary
The thyroid gland is a butterfly-shaped structure located on the ventral surface of the trachea. Calcitonin regulates ca levels in the blood. The 4 parathyroid glands are smaller structures located on the posterior surface of the thyroid gland. It secretes tetraiodothyronin (t4) and triiodothyronin (t3), as well as calcitonin. It regulates the body"s metabolic rate, and is necessary for normal growth and development. secrete parathyroid hormone (pth), an important regulator of ca levels in the blood. Thyroid hormones show little variation and their plasma levels are nearly steady. They don"t normally trigger effects, instead they work to maintain status quo. The thyroid and gland contains numerous follicles that produce thyroid hormones. Each consists of a single outer layer of follicular cells surrounding a central protein rich colloid secreted by the follicular cells. In the interstitial space between the follicles are c cells, which synthesize and secrete calcitonin.
