Question

1. Describe the hormonal control of Ca²⁺ homeostasis

Key:   Parathyroid                            calcitonin           increase               calcium               PTH

The thyroid gland also produces the hormone_________________which causes bones to store calcium ions (Ca⁺²).

________________________glands are 4 tiny glands located on the thyroid gland that secrete parathyroid hormone (_____)   to control calcium metabolism by increasing the levels of _______________ions (Ca⁺²) in blood. Parathyroids ____________ levels of calcium ions by   1. release Ca++ from bone; 2. Promotion of reabsorption of Ca++ by kidneys; 3. Increase absorption of Ca++ by intestines in presence of vitamin D.

2. Explain the regulation in the kidneys of Na⁺ and K⁺ balance by antidiuretic hormone, aldosterone, and atrial natriuretic factor.

If a person has ingested too much salt, the kidney does what it can to lower the salt levels in blood.

More ADH (antidiuretic hormone) results in less water in urine

Hormone from the heart (atrial natriuretic factor) results in more sodium ions in urine

Inhibition of aldosterone leads to more sodium ions in urine.

Net result is less water is lost but the excess sodium is excreted in the urine

Do you ever consider how much salt you are getting in your own diet? ___________________

What organ of your body helps get rid of excess salt? __________________________________

Do you know that too much salt in your diet can contribute to hypertension? ________________

Do you know that too much salt in your diet can possibly stress the function of your kidneys? ______

50.5 Hormonal Control of Growth and Development

1. List and describe the function of the polypeptide hormones involved in the regulation of growth and development in vertebrates.

Key:      gigantism                            growth                 acromegaly                        dwarfism

Anterior pituitary makes and releases _____________hormone (GH)

A person who grows too tall because of too much growth hormone suffers from ________________

A person who grows too small because of too little growth hormone has ____________________

Feet, hands, and face grow too big as an adult due to too much growth hormone during adulthood is called ___________

Fill in blanks.

Answer 1