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astra-53 [7]
2 years ago
8

When during fetal development do rhythmic breathing movements begin?

Biology
2 answers:
zaharov [31]2 years ago
4 0

in the third trimester

gogolik [260]2 years ago
3 0
It should be when A. late in the third trimester, specifically months 7 and 8. It can't be B or D because the baby is breathing and getting oxygen through the placenta. It's not C because the lungs will de fully developed by the time the baby is out. In the 3rd trimester "the lungs are still developing still shortly before birth, but rhythmic breathing movements begin before lungs are fully developed." Its in my notes. I hope this helps!
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1.Continuous diffusion of negatively charged ions into the postsynaptic neurons , <u>which  leads to continuous reversal of charges (hyperpolarization) and therefore continuous firing of action potential</u>

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Neuron whose dendrites  transmits action potential to the  neuromuscular junction is called presynaptic neuron. While  neuron that  transmit action potential away from the neuronal synaptic junction, or from the neuromuscular  junction to the cell body of adjacent neuron or to effectors (gland and muscles) are called  post synaptic  neuron.

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