A chemical signal that has both endocrine and neural roles is?
melatonin
calcitionin
epinephrine
epinephrine
C.
epinephrine
Epinephrine secreted from the medulla of adrenal gland acts as both, an endocrine hormone and as a neurotransmitter (produced at the ends of sympathetic never fibres).
Epinephrine as hormone accelerates metabolic rate for preparing us to face emergency situations.
As neurotransmitter, it transmits nerve impulse across a synaptic left. Calcitonin is released when Ca2+ level increases, melatonin causes concentration of pigment in melanocytes and cortisol is a glucocorticoid.
The nerve centres which control the body temperature and the urge for eating are contained in
hypothalamus
pons
cerebellum
cerebellum
Toxic agents present in food which interfere with thyroxine synthesis lead to the development of
toxic goitre
cretinism
simple goitre
simple goitre
Which one of the following pairs is incorrectly matched?
Glucagon - Beta cells (source)
Somatostatin - Delta cells (source)
Corpus luteum - Relaxin (secretion)
Corpus luteum - Relaxin (secretion)
Injury to the adrenal cortex is not likely to affect the secretion of which one of the following?
Aldosterone
Both androstenedione and dehydroepiandrosterone
Adrenalin
Adrenalin
Match the source gland with its respective hormone as well as the function.
| Source gland | Hormone | Function |
| Posterior pituitary | Vasopressin | Stimulates resorption of water in the distal tubules in the nephron |
| Source gland | Hormone | Function |
| Corpus luteum | Oestrogen | Supports pregnancy |
| Source gland | Hormone | Function |
| Thyroid | Thyroxine | Regulates blood calcium level |
| Source gland | Hormone | Function |
| Thyroid | Thyroxine | Regulates blood calcium level |
Select the correct matching of a hormone its source and function.
|
Hormone |
Source |
Function |
|
Vasopressin |
Posterior Pituitary |
Increases loss of water through urine |
|
Hormone |
Source |
Function |
|
Norepinephrine |
Adrenal medulla |
Increases heartbeat, rate of respiration and alertness |
|
Hormone |
Source |
Function |
|
Glucagon |
Beta-cells of Islets of Langerhans |
Stimulates glycogenolysis |
|
Hormone |
Source |
Function |
|
Glucagon |
Beta-cells of Islets of Langerhans |
Stimulates glycogenolysis |
The 24 hour (diurnal) rhythm of our body such as the sleep -wake cycle is regulated by the hormone
Calcitonin
prolactin
adrenaline
adrenaline
Which one of the following pairs of chemical substances, is correctly categorised?
Calcitonin and thymosin - Thyroid hormones
Pepsin and prolactin - Two digestive enzymes secreted in stomach
Troponin and myosin - Complex proteins in striated muscles
Troponin and myosin - Complex proteins in striated muscles
