1. All cells secrete enzymes and hormones
2. Most cells secrete hormones
3. A few cells secrete enzymes
4. Enzymes and hormones are secreted by separate cells
Enzymes and hormones are secreted by separate cells
1. STH cells
2. β-cells of Islets of Langerhans
3. Cells of leydig
4. Cells of leydig
β-cells of Islets of Langerhans
1. Removal of the gland subsequent analysis of what functions are lost
2. Transplantation of the gland into an animal that lacks the gland
3. Transfusion of blood from an animal lacking the gland into an animal that has the gland and observation of its effects
4. Observing effect of gland extract on various tissues grown in culture
Transfusion of blood from an animal lacking the gland into an animal that has the gland and observation of its effects
1. Conditions outside the body
2. Rising levels of another hormone
3. Rising levels of the hormone in question
4. Falling levels of the hormone in question
Rising levels of the hormone in question
1. Change in genetic make-up
2. Change in permeability
3. Change in metabolic rate
4. Increase in cyclic AMP concentration
Change in genetic make-up
1. The endocrine system responds faster
2. The endocrine response usually lasts longer
3. The endocrine system is turned more precisely to the degree of need
4. The endocrine system affects only the target organ whose response is needed to meet the emergency
The endocrine system affects only the target organ whose response is needed to meet the emergency
1. Ependymal cells
2. Sarcoplasmic reticulm
3. Osteoclasts
4. Osteocytes
Osteoclasts
1. Sertoli cells
2. Spermatogonia
3. Leydig’s cells
4. Primary spermatocytes
Leydig’s cells
1. Estrogen
2. Thyroxine
3. Relaxin
4. Progesterone
Progesterone
1. Osteitis fibrosa cystic
2. Polydispia
3. Osteomalacia
4. None
Osteitis fibrosa cystic