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3 years ago

Ileocecal sphincter tone decreases (relaxes) after distention of which structure?

1 answer:

6 0

Ileocecal sphincter tone decreases after distention of colon. This sphincter separates ileum and cecum and is under the control of vagus nerve.

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What are tissues?? and what are cells?

Slav-nsk [51]

Answer:

Tissues-

Tissue is a group of cells that have similar structure and that function together as a unit. A nonliving material, called the intercellular matrix, fills the spaces between the cells. This may be abundant in some tissues and minimal in others.

Cells-

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.

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3 years ago

The number of bones in the appendicular skeleton is

VMariaS [17]

Answer:

E... 126

Explanation:

The appendicular skeleton includes all bones of the upper and lower limbs, plus the bones that attach each limb to the axial skeleton. There are 126 bones in the appendicular skeleton of an adult

5 0

3 years ago

Many scientists classify viruses as non-living. The single, MOST important reason why viruses are classified as non-living is th

VARVARA [1.3K]

The most important reason they are considered non living is because they cannot live and reproduce without the help of a host cell.

6 0

3 years ago

Read 2 more answers

Compared with DNA replication, transcription is _______ error prone because of differences in _______.

Tatiana [17]

Answer:

more ; the proofreading system

Explanation:

Transcription is considered to be more error prone and this is mainly attributed to differences in the proofreading system.

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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:

What he has in common is:

*The sequence of several complex membrane proteins transporting electrons.

*The conversion of DNA into ATP.

The differences 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).

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3 years ago