Examlex
Which of the following is a result of gastrulation in animals?
I.The archenteron is formed.
II.The body axes are established.
III.The germ layers are formed.
Endorphins
Natural, pain-relieving chemicals produced by the body that promote a sense of well-being and can reduce pain.
Neurotransmitters
Chemical substances in the nervous system that transmit signals from one neuron to another across synapses.
Opioid Peptides
Natural chemicals in the brain that act like morphine, playing key roles in pain relief, reward, and addictive behaviors.
Oxytocin
A hormone and neurotransmitter involved in childbirth, lactation, and social bonding.
Q4: What major advantage is conveyed by having
Q14: In male mammals, excretory and reproductive systems
Q19: _ are cells of the mammalian innate
Q27: Based on the graph, which of the
Q32: Most of the chemosensory neurons arising in
Q36: A stickleback fish will attack a fish
Q43: A bone marrow transplant may not be
Q49: A primary response by the Leydig cells
Q51: Pair-bonding in a population of prairie voles
Q56: When a steroid hormone and a polypeptide