Option A. Increases and decreases of the heart rate result from changes in the activity of the <u>medulla oblongata</u>
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What is medulla oblongata ?
- Medulla oblongata, also called medulla, the lowest part of the brain and the lowest portion of the brainstem.
- The medulla oblongata is connected by the pons to the midbrain and is continuous posteriorly with the spinal cord, with which it merges at the opening (foramen magnum) at the base of the skull.
- The medulla oblongata plays a critical role in transmitting signals between the spinal cord and the higher parts of the brain and in controlling autonomic activities, such as heartbeat and respiration
- The medulla is divided into two main parts: the ventral medulla (the frontal portion) and the dorsal medulla (the rear portion; also known as the tegmentum).
- The ventral medulla contains a pair of triangular structures called pyramids, within which lie the pyramidal tracts.
- The pyramidal tracts are made up of the corticospinal tract (running from the cerebral cortex to the spinal cord) and the corticobulbar tract (running from the motor cortex of the frontal lobe to the cranial nerves in the brainstem)
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Amber fossil is <span>formed when remains are trapped tree sap
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<span>Petrified fossil are preserved remains that are transformed into rock.
Imprint fossils are </span><span>impressions from very thin objects trapped in mud and transformed into rock.
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Trace fossils are </span><span>preserved records of life like a footprint or a trail imprint fossils a raised fossil that has filled in the impression from.
Mold fossils are</span> formed when remains of living things leave an impression on a rock.
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Cast fossils are </span><span>a raised fossils that have filled in the impression from a mold.</span><span>
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<span>The
answer is facilitated diffusion. It requires no energy because the ions are
traveling down the concentration
gradient. Facilitated diffusion is important
for the regulation of ions in a cell. It also enables
ions to pass across the hydrophobic layer of the cell membrane composed
of phospholipids.</span>
Answer:
5. C- Adenine
6. -
Explanation:
I don't yet know question 6 sorry
Can you put the question here?
