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Vadim26 [7]
3 years ago
14

Which process normally occurs at the placenta?

Biology
2 answers:
Oksi-84 [34.3K]3 years ago
6 0

1 one

Explanation:

Which process normally occurs at the placenta? (1) Oxygen diffuses from fetal blood to maternal blood. (2) Materials are exchanged between fetal and maternal blood. (3) Maternal blood is converted into fetal blood.

scoray [572]3 years ago
3 0

Answer is option 1 oxygen diffuses from fetal blood to maternal blood

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identify the subcellular structure of the neuron that forms the basis for the transmission of nerve impulses. (2 points) describ
melisa1 [442]

The subcellular structures of neuron that forms the basis for transmission of nerve impulses are the synaptic vesicles.

What are the steps in impulse transmission between neurons?

  • The action potential or nerve impulse reaches the <u>axon</u> of neuron and depolarises the membrane.
  • Voltage gated Calcium channels open .
  • Arrival of action potential causes the synaptic vesicle to attach to presynaptic membrane.
  • Calcium influx triggers release of neurotransmitter.
  • This neurotransmitters bind to postsynaptic membrane and new impulses are created.

Synaptic vesicle under resting condition:

  1. The neurotransmitter molecules are stored in synaptic vesicles.
  2. If the neurotransmitter leak from the vesicles, they are destroyed by enzymes.
  3. During resting condition, they are placed randomly.
  4. When an impulse reaches the axon, vesicles are arranged in the presynaptic membrane.

Thus from the above we can conclude that, synaptic vesicles are the subcellular structures in transmission of nerve impulses and , under resting condition they are placed randomly.

To know more about transmission of nerve impulses :

brainly.com/question/840056

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4 0
1 year ago
Which of the following was and an achievement of reign of Constantine?
Vanyuwa [196]

Answer:

B. The Edict of Milan helped spread Christianity by allowing all religions in Rome.

D. He believed that locating the capital in an area that had more trade and business would ensure the future of the empire.

Explanation:

The great achievement of reign of Constantine is the Edict of Milan that helped in spreading of Christianity in Rome. He was the first roman emperor which profess the religion of Christianity in the year 313. This proclamation legalized the Christianity religion and allowed all people of Rome the freedom of worship throughout the empire. Constantine move the capital of the Roman Empire because he wanted that the capital will become the economic, cultural hub and center of the east.

4 0
3 years ago
Do you think rain amounts can affect soil type?
Zielflug [23.3K]
Yes, I do think so. I believe the rain can break up the soil depending on the type of soil as well as rain amounts. If it doesn't rain much in California their soil might be dry and brittle, but id it rains in South Carolina theirs might by softer and moist. 
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3 years ago
In which situation are you likely to find a trait with only one allele?
Reika [66]

If the expression of a trait requires only one copy of a gene (one allele), that trait is considered dominant. If the expression of a trait requires 2 copies of a gene (2 alleles), that trait is considered recessive. One exception is X-linked disorders.

4 0
2 years ago
What calculators are allowed on the ap biology exam?.
3241004551 [841]

Answer:

fourfunction, scientific, or graphing calculator

Explanation:

6 0
2 years ago
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