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mafiozo [28]
3 years ago
14

During a blood drive, Shaun noticed that the nurse punctured his vein to connect the tube for withdrawing blood. Why is blood ob

tained through veins and not from arteries when collecting blood? A. Veins have lower blood pressure than arteries. B. Veins have fewer valves than arteries. C. Veins have a larger diameter than arteries. D. Veins have more tissue layers than arteries.
Biology
2 answers:
8_murik_8 [283]3 years ago
4 0
A, venus has elower blood pressure than arteries.
Nataly [62]3 years ago
3 0

Answer:

A. Veins have lower blood pressure than arteries.

Explanation:

During blood sampling, blood is taken from veins as they are present closer to the skin. They have thin walls and no valves. Lower blood pressure in veins as compared to arteries ensures that puncturing the vein does not cause blood loss in higher amount. Arteries have higher blood pressure and puncturing them may cause blood to seep out from the puncture point.

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Why does a female’s cervix dilate prior to delivering a baby?
cluponka [151]

Effacement: The cervix – which is normally long and thick, measuring about 1-2 inches, starts to get shorter and thinner. This process is known as effacement. As the cervix gets more and more effaced, it gets shorter and shorter and “pulled up” into the lower part of the uterus.

Dilation: At the same time, the cervix softens and begins to open up – known as dilation. This widening, allows a smooth passage for the baby’s head and the rest of the body from the uterus into the vaginal canal.

5 0
3 years ago
Contrast the electron transport chain in photosynthesis with the one in cellular respiration by identifying sources of the high-
nlexa [21]

Respiration:

The respiratory chain detailed here is that of mammalian mitochondria:

NADH → NADH dehydrogenase → ubiquinone (coenzyme Q10) → coenzyme Q-cytochrome c reductase → cytochrome c → cytochrome c oxidase → O2;

succinate → succinate dehydrogenase → ubiquinone (coenzyme Q10) → coenzyme Q-cytochrome c reductase → cytochrome c → cytochrome c oxidase → O2.

It consists of the following elements:

The high transfer potential electrons of NADH are transmitted to coenzyme Q10 (ubiquinone) by NADH dehydrogenase, or complex I. Reduced coenzyme Q10 is ubiquinol Q10H2.

The electrons with a high succinate transfer potential are transferred to coenzyme Q10 by succinate dehydrogenase, or coenzyme II, also giving ubiquinol Q10H2.

Ubiquinol Q10H2 transfers its electrons to two cytochromes c under the action of coenzyme Q-cytochrome c reductase, or complex III.

Four cytochromes c each transfer their electron to an oxygen molecule under the action of cytochrome c oxidase, or complex IV. Two molecules of water are formed.

Each of these four respiratory complexes has an extremely complex structure partially included in the internal mitochondrial membrane. Apart from the complex II, they are proton pumps. The electrons circulate between these structures on liposoluble or hydrophilic electron transporters depending on the case.

Photosynthesis:

Photophosphorylation is the equivalent, for photosynthesis, of oxidative phosphorylation for cellular respiration. It constitutes the "light phase" of photosynthesis, that is, it groups together light-dependent reactions.

In plants, photophosphorylation occurs in the membrane of thylakoids, within chloroplasts:

H2O → photosystem II (P680) → plastoquinone → cytochrome b6f complex → plastocyanine → photosystem I (P700) → ferredoxin → ferredoxin-NADP + reductase → NADP +;

cyclic photophosphorylation: (ferredoxin →) plastoquinone → cytochrome b6f complex → plastocyanine → photosystem I (P700) → ferredoxin (→ plastoquinone).

Contrast:

<u>What he has in common is:</u>

*The sequence of several complex membrane proteins transporting electrons.

*The conversion of DNA into ATP.

<u>The differences</u> are in the transport proteins themselves, as well as the direction of H + flux (to the cytoplasm for photosynthesis, and to the mitochondrial matrix in respiration).

8 0
3 years ago
________ is a neurotransmitter that may be linked to schizophrenia.
True [87]

Answer:

Dopamine

Explanation:

Dopamine is an inhibitory neurotransmitter involved in the pathology of schizophrenia.

4 0
3 years ago
CORRECT ANSWER ONLY IF YOU KNOW IT!!!!!!!!!!!!!!!!!!!!!!!!
11Alexandr11 [23.1K]

Answer: B

Explanation:

5 0
3 years ago
Jenny is learning about the importance of the ozone layer. She was upset to know that there is a depletion of the ozone layer an
Marianna [84]

UV rays reacting with the O2 molecules

I might be wrong a little but

Hope the helps :)

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