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Zarrin [17]
3 years ago
10

1. What causes the autorhythmicity or action potentials of the nodal cells? a. A decrease in chloride permeability b. A gradual

calcium efflux or movement out of the cell c. A gradual depolarization of the cell membrane until threshold is reached d. A gradual repolarization of the cell membrane until threshold is reached
Biology
1 answer:
Sveta_85 [38]3 years ago
5 0

Answer:

The correct answer will be option-C

Explanation:

The rhythm of the heartbeat is controlled by the pacemaker of the heart called the sino-atrial node.

The SA node generates action potentials which trigger the contraction and relaxation of the atrium and ventricles. The membrane potential generation initiates by the depolarization of the cell membrane when the L type of Ca⁺² ions opens up and calcium ions enter the cell.

This depolarizes the cell until the potential threshold is reached which lies between the -40 and -30 mV.

Thus, Option-C is the correct answer.

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A small percentage of the body’s iron supply circulates freely in the blood, bound to a protein called transferrin. Transferrin
german

Answer:

What best describes how transferrin is transported through the erythrocyte plasma membrane is receptor-mediated endocytosis.

Explanation:

The incorporation of transferrin across the erythrocyte membrane depends on a transferrin receptor expressed on the surface of the membrane. The specific receptor recognizes the presence of iron-charged transferrin, transferin diferrica, incorporating it into the cell by endocytosis. Once in the cytoplasm, the iron is dissociated from the transferrin.

Free transferrin is called apotransferrin. The transferrin receptor has a high affinity for transferrin di-ferrica, which facilitates its incorporation by endocytosis, and the release of apotransferrin into the extracellular space.

The other options are not correct because:

<em>     A. </em><u><em>Exocytosis</em></u><em> implies the exit of substances from the cell.</em>

<em>     B. </em><u><em>Pinocytosis</em></u><em> involves the invagination of the membrane to incorporate soluble substances into the cell.</em>

<em>     C. </em><u><em>Phagocytosis</em></u><em> is the incorporation of solid substances by invagination of the membrane.</em>

4 0
3 years ago
The world resources simulation center is intended to address both current and future resource problems. please select the best a
lianna [129]

The world resources simulation center being intended to address both current and future resource problems is True.

<h3>What is World resources simulation center?</h3>

This is referred to as a visualization facility where you can see the trends, issues and how their the relate with one another.

The consequences of such relationships is also seen which is why it helps to address both current and future resource problems.

Read more about Resources here brainly.com/question/1290230

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8 0
2 years ago
The act of reproducing the behavior of a process using a model that describes each step of the process is called:___.
AlladinOne [14]

The act of reproducing the behavior of a process using a model that describes each step of the process is called simulation.

<h3>What is simulation?</h3>
  • A simulation is an ongoing replica of how a system or process might work in the actual world.
  • Models must be used in simulations.
  • The model reflects the essential traits or behaviors of the chosen system or process, whilst the simulation depicts the model's development over time.
  • A computer simulation of an industrial process is an imitation of how one system or process operates through the operation of another.
  • A simulation is a model or representative example of anything, according to the definition.
  • A simulation is when you design a computer program with the goal of simulating piloting an aircraft.
  • Simulation is fundamentally used to illuminate the underlying mechanics that govern a system's behavior.

Learn more about simulation here:

brainly.com/question/23844272

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7 0
2 years ago
Explain the difference between microevolution and macroevolution​
xxTIMURxx [149]
Microevolution is small genetic changes within a specific population or a group within a population, occurring within a short time span, like one generation. Macroevolution is big changes across species and over long spans of time.
6 0
2 years ago
The most common molecule in the human body is made of what elements?
Aloiza [94]
Would it be talking about water? In which case the answer would be hydrogen and oxygen.
3 0
3 years ago
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