Describe how breathing is controlled

1 answer:

8 0

The medulla oblongata is a primary respiratory control center. It’s main function is to send signals to the muscle that controls respiration to cause breathing to occur. There are two regions in the medulla that control respiration the ventral respiratory group stimulates expiratory movement.

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Which phrases are true of only the mantle? Check all that apply.

Over [174]

Answer:

i had to list all the facts cuz we didnt have a diagram

Explanation:

The mantle is the mostly-solid bulk of Earth's interior. The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth's total volume.

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3 years ago

Which organelle is responsible for producing the energy for cellular processes? organelle A organelle E organelle F organelle G

Doss [256]

The right answer is organelle G, which represents mitochondria.

Mitochondria is the place of cellular respiration. This is a set of reactions that convert glucose into the energy molecule, ATP. This process involves several steps, including the "Krebs Cycle", a set of metabolic reactions that takes place in the mitochondrial matrix. The enzyme that produces ATP is found in the inner membrane of the mitochondria. For these reasons, the mitochondria is often referred to as the cell's energy factory.

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3 years ago

Which of the following structures is NOT found in some prokaryotic cells?

WARRIOR [948]

The answer would be:

Cilium

Here is more about the structures of prokaryotic cells:

Axial filament is a bundle of flagella that are wrapped around the cell's body.

Flagellum is what the prokaryotic cell has that is whip-like in structure. It helps with the motility of the cell.

Pilus is a hair-like structure that are found on the surface of prokaryotic cells. They help the cell attach itself to surfaces.

Peritrichous flagella are several flagella that can be found all over some prokaryotic cells.

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2 years ago

Mimicry or camouflage ?

Tamiku [17]

Answer:

i think mimicry

Explanation:

6 0

2 years ago

Read 2 more answers

You measure levels of Ca2+ in various locations within a motor neuron and a skeletal muscle fiber when the motor neuron is NOT d

gogolik [260]

Answer:

The correct answer is 3: "High levels of Ca2+ are expected to be found within the sarcoplasmic reticulum".

Explanation:

Muscular contraction is a highly regulated process that depends on free calcium concentration in the cytoplasm. Amounts of cytoplasmic calcium are regulated by sarcoplasmic reticulum that functions as a storage of the ion.

When a nerve impulse reaches the membrane of a muscle fiber, through acetylcholine release, the membrane depolarizes producing the entrance of calcium from extracellular space. The impulse is transmitted along the membrane to the sarcoplasmic reticulum, from where calcium is released. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. The calcium channel in the sarcoplasmic reticulum controls the ion release, that activates and regulates muscle contraction, by increasing its cytoplasmic levels. When calcium binds to the troponin C, the troponin T alters the tropomyosin by moving it and then unblocks the binding sites, making possible the formation of cross-bridges between actin and myosin filaments. When myosin binds to the uncovered actin-binding sites, ATP is transformed into ADP and inorganic phosphate.

Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.

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3 years ago