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AleksAgata [21]
2 years ago
6

What type of muscle contracts and relaxes to control the movement of the contents?

Biology
1 answer:
Brut [27]2 years ago
8 0

Smooth muscles are the type of muscle that contracts and relax to control the movement of the contents.

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What are Smooth muscles?

Because it lacks sarcomeres and as a result, striations, smooth muscle is an involuntary non-striated muscle (bands or stripes). Its two subgroups are single-unit smooth muscle and multi-unit smooth muscle. A syncytium is the collective contraction of the sheet or bundle of smooth muscle cells that make up a single-unit muscle.

Smooth muscle makes up the walls of hollow organs including the stomach, intestines, bladder, and uterus as well as the blood and lymphatic vessels, as well as the tracts of the respiratory, urinary, and reproductive systems. The ciliary muscle, a type of smooth muscle present in the eyes, changes the shape of the lens by dilation and contraction of the iris.

To learn more about smooth muscles, visit:

brainly.com/question/9883108

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What should be worn at all times while climbing a tree or in a tree stand?
Reil [10]

Answer:

A fall-arrest system should be worn while climbing a tree or any tall structure. This will enable the person to have a thing to break or slow his fall if he loses his grasp from the trunk of the tree.

8 0
3 years ago
1. What would be a probable explanation for why there are many endemic plants and birds in New Zealand, but no native mammals? (
Vadim26 [7]

1. The answer is B. Birds can fly across the oceans and settle in either island that makes up New Zealand. Plants also can produce pollen and seeds that can be easily dispersed by wind or water to either island. The distribution of birds and animals across the more or less uniform. However, animals are unable to make ocean crossing hence each island has its own species of animal that is adapted to its island’s environment.


2. The answer is A. Endemic species means species that are specifically adapted to a particular environment and can only be found there due to the high adaptation to the environment over many years. The Bighorn sheep are native to North America, not in New Zealand.


3. The answer is D. Million of years ago, the continents were one continent called Pangea. Due to tectonic plate movement, powered by the convection currents of the mantle, Pages broke off into the continents we have today. Using the jigsaw puzzle, the initial location of a continent in Pangea can actually be determined by checking their current location and the shape of their coastal outline that fits into that of their closest continent. This is true for New Zealand that fits in between the Australian and Pacific plates.


4. The answer is Stewart Island. This island is also the third biggest of the islands that make up New Zealand. It is inhabited by approximately 500 people in a settlement known to the locals as Oban. It experiences an oceanic climate of high rainfall and warm weather like the rest of New Zealand and has many birds species.


5. The answer is The roaring forties bring strong west winds from the Indian Ocean. The roaring forties are the westerly winds in the southern hemisphere that are caused by descending cooler air being deflected towards the south pole by the earth's Coriolis effect. They pass across the Australian land mass and are warmed before picking the moisture over the Tasman Sea. This wets these winds that bring rainfall to Southern Island’s west coast.


6. The answer is Te Anau. The Milford Trek is popular with tourism in the Fiordland. Visitors use the Milford Trek to hike, visit the Fiordland National Park, Doubtful Sounds and Milford Sound, kayaking, fishing and hunting, and etcetera. Te Anau also hosts the Kepler Challenge that involves marathon competition through the Fiordland National Park.


7. The answer is They act as a barrier, protecting the area east from the prevailing west winds. The Southern Alp are formed due to the collision of the Indo-Australian plate and the Pacific Plate. When the wet roaring forties from the west hit the southern Alps, they bring rain to the windward side (that is the west coast), while the leeward side (the east) is protected from the strong winds and the winds also become drier because most rainfall has been shed from the forties.


8. The answer is Kiwi. These birds have nocturnal behaviors a behavior attributed to having been acquired due to the intrusion of their habitat by predators and humans. The birds have a strong sense of smell unlike other birds with nostrils at the end of their long beaks. However, they can so be sighted at daytime but more so often during the night.


9. The answer is 3 days. The Milford Track is approximately 53 kilometers long starting at Lake Te Anau, passing through the Fiordland National Park and finish it at Milford Sound. One needs to camp along the Track during the night hence the 3 – 4 day taken to hike.


10. The answer is Silver Beech. The Fiordland National park also has podocarps trees. The main understory plants in the park are crown ferns, mosses, and liverworts due to the wet climate in the region.


7 0
3 years ago
Read 2 more answers
Why are biofuels not necessarily the answer to energy problems?
tiny-mole [99]

1. Vantagens do uso dos biocombustíveis

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- No caso específico do Brasil, há grande área para o cultivo de plantas que podem ser utilizadas para a produção de biocombustíveis ; 

- Geração de emprego e renda no campo (assim evita o inchaço das cidades);

- Menor investimento financeiro em pesquisas (como pesquisas de prospecção de petróleo são muito despendentes);

- O substituto de biodiesel bem o óleo diesel sem necessidade de ajustes sem motor;  

- Redução do lixo no planeta (pode ser usado para produção de biocombustível ); 

- Manuseio e armazenamento de seguros e combustíveis fósseis.

 

2. Desvantagens do uso dos biocombustíveis

- Consome grande quantidade de energia para uma produção;

- Aumento de consumo de água (para irrigação das culturas);

- Redução da biodiversidade;

- Como culturas para produção de biocombustíveis consomem muitos fertilizantes nitrogenados, com liberação de óxidos de nitrogênio, que também são gases estufa;  

- Devastação de áreas florestais (grandes consumidoras de CO 2 ) para plantio das culturas envolvidas na produção dos biocombustíveis ; 

- Possibilidade de redução de produção de alimentos em detrimento do aumento da produção de biocombustíveis , o que pode contribuir para aumentar da fome no mundo eo encarecimento dos alimentos; 

- Contaminação de lençóis freáticos por nitritos e nitratos, participação de fertilizantes. A ingestão dos produtos causadores respiratórios, devido à produção de meta-hemoglobina (hemoglobina oxidada);

- A queima da cana libera grandes quantidades de gases nitrogenados, que retornam ao ambiente na forma de “chuva seca” de fertilizantes, segundo pesquisa do químico ambiental Arnaldo Cardoso e publicada na revista “Unesp Ciência, edição de fevereiro de 2010.  Nos ambientes aquáticos, o efeito é muito rápido: proliferação de algas, com liberação de toxinas e consumo de quase todo oxigênio da água, o que provoca a morte de um grande número de espécies.

5 0
3 years ago
If theres a small amount of friction between two surfaces, the result could be?
Serjik [45]

Answer: Depending on the subject, friction can cause heat, slow acceleration, or erode something.

3 0
3 years ago
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Atmosphere and Biospheres
3 0
2 years ago
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