We use the classification system when grouping organisms, which are very diverse. The sub-group with the least amount of diversity is the species. The measure of diversity in this classification will of the variation in genome and physical characteristics. The species have a slight variation in the genome and phenotype compared to the amount of variation in a genus, where related species are clubbed together. The amount of diversity increases from the nodes of a classification tree to its root or parent (kingdom).
Answer:
Oxytocin and antidiuretic hormone
Gordon is having trouble sleeping and decides to take a supplement containing a hormone that is manufactured in the pineal. What is he most likely taking?
A) leptin
B) glucagon
C) melatonin
D) renin
Answer:
C) melatonin
Explanation:
Melatonin is a water-soluble hormone secreted by the pineal gland. The function of this hormone is to maintain the biological clock of the body. In the darkness, the sensory information from retina makes the suprachiasmatic nucleus to trigger the sympathetic postganglionic neurons of the superior cervical ganglion. The information from these ganglion makes the pineal gland to secrete melatonin causing sleepiness. A lesser amount of melatonin is secreted in the daytime. A person having trouble with sleeping would take melatonin supplements to regulate the biological clock.
