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Andrei [34K]
3 years ago
8

The rapid depolarization phase of the action potentials of myocardial contractile cells is due primarily to which ion(s)?

Biology
1 answer:
Lyrx [107]3 years ago
5 0

The rapid depolarization phase of myocardial contractile cells is due to the Na+ ions. Sodium ions are essential for regulation of blood and body fluids, communication of nerve impulses, heart activity, and metabolic purposes. Physiologically, it survives as an ion in the body. Sodium is needed by animals but is not needed by plants. The human prerequisite for sodium<span> must be less than 500 mg per day. </span>

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Which three of the following entities are acellular?.
arsen [322]

Answer:

Prions archea, viroids bacteria, viruses protists are acellular while fungi is cellular.

While viruses have indeed been closely researched for more than a century for infections of people and animals, most viruses, particularly those that infect microorganisms, are still poorly understood. 

Pathogenic RNA molecules are known as viroids. Contagious protein particles are identified as prions. Viruses are larger than that of viroids. Viroids are larger than prions in size.

Molds, wild yeasts, as well as mushrooms are examples of fungi. Numerous fungi are multicellular and also have nuclei in their cells. A protein-encased DNA or RNA core defines viruses being non - cellular organisms. Some scientists disagree with the notion that viruses are living things.

You can learn more from the following  link:

brainly.com/question/28475730cellular

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7 0
2 years ago
Hydroelectric power produces electricity using?
8090 [49]
Water because hydro means water
4 0
4 years ago
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The sensory receptors in the nose send signals to the ________. These signals are then processed by the _______, which sends a r
PSYCHO15rus [73]
Olafactory bulbs because it has to do with nerve signals and neurons. Brain because it is the center of the nervous system and the closest to the nose in terms of the nervous system. 
6 0
3 years ago
During what stage does land get ready for the arrival of a new species
34kurt

Answer

           The correct option is B.

Explanation

          Ecological succession of any species is composed of following stages:

A. Migration

            The movement of species from one place to another location for the purpose of setting permanently o temporary is known as migration . Forexample

             Siberian crane (<em>Leucogeranus leucogeranus</em>) that live in the arctic tundra of eastern and western Russia. The eastern population of birds migrate to china while western population of these birds migrate to Iran, India and Nepal during winter season.

B. Ecesis

         The complete establishment of species in new habitat that was completely barren or left barren due to some catastrophe is known as Ecesion. This process is dependent upon the climatic, edaphic and biotic factors. The success of plant depend upon some of the adaptations to withstand the unfavorable conditions which includes both biotic and abiotic conditions.

Forexample

               The process of succession in xerosphere start on barren area from pioneer stage covered by crustose lichen, then foliose lichen followed by moss stage, herbaceous stage and a last by shrub stage.

C. Nudation

       The initiation of new species by major environmental disturbance such as volcano eruption is known as Nudation.

D. Reaction

            It represents the effect of established species on the habitat. Forexample plants alter habitat condition as they grow. They extract raw materials from the environment in large amounts and return metabolic wastes. The waste accumulates in large amounts and differ from the original raw materials, thus altering the environment.  

E. Competition

             The phenomenon which involves struggle for existence between two or more individuals growing in same area, that make excessive demand that are similar in nature on the soil is known as competition.

Such struggle may be in between same species or different species. The competition may be interspecific or intraspecific. Because of completion the weak individuals are eliminated as strong ones are retained.

 


8 0
3 years ago
What is the best source of vitamin C?<br> - Cheddar Cheese<br> -strawberries<br> -lentils
seraphim [82]
<span>-strawberries i hope dis helps you</span>
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4 years ago
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