Cơ chế điều hòa cân bằng nội môi diễn ra theo trình tự nào sau đây?
A. Kích thích → Trung khu điều hòa → Thụ thể → Cơ quan trả lời.
B. Kích thích → Cơ quan trả lời → Thụ thể → Trung khu điều hòa.
C. Kích thích → Thụ thể → Trung khu điều hòa → Cơ quan trả lời.
D. Kích thích → Thụ thể → Cơ quan trả lời → Trung khu điều hòa.
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Câu hỏi liên quan
Read the following passage about music and mark the letter A, B, C, or D to indicate the option that best fits each of the numbered blanks from 31 to 40.
SOUND FROM THE PAST
Much of the music we listen to today is a mixture of styles from various countries and time periods. A lot of music has roots in older traditional songs heard in many different countries around the world. Traditional, or folk, music is collected over decades, if not centuries. Younger generations learn these songs from their elders through practice and repetition.
Since music can tell us a lot about different cultures through its lyrics, melodies, and the instruments used, researchers and music fans see music as an essential part of history. They fear that traditional and older types of music are slowly disappearing, partly because they are less likely to be written down or recorded, or because the format in which they are recorded is no longer in use. Also, younger generations may not find such music very appealing, so once older generations pass away, the music may die out with them. Whole genres of music may go extinct.
There is a growing effort to preserve music in its many forms. Some researchers create field recordings – those made outside of a recording studio – to capture live performances. For example, in the early 1900s, social scientist Frances Densmore made recordings of Native American songs that had been sung for many generations but were in danger of falling by the wayside. Researchers also transcribe old music by listening to old recordings – sometimes the only one of its kind left. They try to write out the music so that it can be studied and played by modern musicians.
[I] Collecting music is another form of music preservation. [II] Some collectors are extremely passionate about their music and will spend a lot of time and money looking for things that have not been produced or sold for many years. [III] Their efforts help to document the music of different cultures, genres, time periods, and places. [IV] There are also associations and societies to preserve and celebrate very specific kinds of music.
Now, modern technology makes it much easier to preserve music. Smartphones can be used to record music, while the Internet lets us share these recordings and connect with like-minded enthusiasts. Soon, losing a piece of music may be a thing of the past.
The phrase ‘falling by the wayside’ in paragraph 3 could be best replaced by ______.
Tìm giá trị nhỏ nhất của biểu thức \(F(x;y)=x-2y\) với điều kiện
\(\left\{ {\begin{array}{*{20}{c}} {\begin{array}{*{20}{c}} {\begin{array}{*{20}{c}} {0 \le y \le 5}\\ {x \ge 0} \end{array}}\\ {x + y - 2 \ge 0} \end{array}}\\ {x - y - 2 \le 0} \end{array}} \right.\)
Kí hiệu nào viết đúng mệnh đề: “\(\sqrt 5 \) không là số nguyên”?
Một sóng cơ học có tần số 500 Hz truyền đi với tốc độ 250 m/s. Độ lệch pha giữa hai điểm gần nhau nhất trên cùng đường truyền sóng là khi khoảng cách giữa chúng bằng
Đây là kí hiệu của
Tháng 12-1920, Nguyễn Ái Quốc đã trở thành một trong những người tham gia
Sóng điện từ và sóng âm khi truyền từ không khí vào thủy tinh thì tần số
Read the passage carefully. Choose an option (A, B, C or D) that best answers each question from 23 to 30.
1. How do children learn about wildlife? And is what they learn the sort of thing they should be learning? It is my belief that children should not just be acquiring knowledge of animals but also developing attitudes and feelings towards them based on exposure to the real lives of animals in their natural habitats. But is this happening?
2. Some research in this area indicates that it is not. Learning about animals in school is often completely disconnected from the real lives of real animals, with the result that children often end up with little or no understanding or lasting knowledge of them. They learn factual information about animals, aimed at enabling them to identify them and have various abstract ideas about them, but that is the extent of their learning. Children's storybooks tend to personify animals as characters rather than teach about them.
3. For direct contact with wild and international animals, the only opportunity most children have is visiting a zoo. The educational benefit of this for children is often given as the main reason for doing it but research has shown that zoo visits seldom add to children's knowledge of animals – the animals are simply like exhibits in a museum that the children look at without engaging with them as living creatures. Children who belong to wildlife or environmental organizations or who watch wildlife TV programmes, however, show significantly higher knowledge than any other group of children studied in research. The studies show that if children learn about animals in their natural habitats, particularly through wildlife-based activities, they know more about them than they do as a result of visiting zoos or learning about them in the classroom.
4. Research has also been done into the attitudes of children towards animals. It shows that in general terms, children form strong attachments to individual animals, usually their pets, but do not have strong feelings for animals in general. This attitude is the norm regardless of the amount or kind of learning about animals they have at school. However, those children who watch television wildlife programs show an interest in and affection for wildlife in its natural environment, and their regard for animals in general is higher.
What opinion does the writer express in the second paragraph?
Khi có kích thích (dòng điện) phù hợp gây hưng phấn, khi đó hệ thần kinh giao cảm – đối giao cảm xuất hiện xung thần kinh tới tim làm cho
Ý nào sau đây là thể hiện vai trò của nhân sách nhà nước?
Theo em, cho vay tín chấp là hình thức cho vay dựa vào điều gì?
Con lắc lò xo nằm ngang có k= 100N/m , m=1kg dao động điều hoà. Khi vật có động năng 10mJ thì cách vị trí cân bằng 1cm khi có động năng 5mJ thì cách vị trí cân bằng một đoạn là
Trong trò chơi "Hãy chọn giá đúng" chiếc kim của bánh xe có thể dừng lại ở 1 trong 20 nấc điểm với khả năng như nhau. Số phần tử không gian mẫu là
Phương án nào sau đây là điều xảy ra nếu KHÔNG tuân thủ quy trình lắp đặt?
Cho hàm số bậc ba \(f(x)\) có đồ thị như hình vẽ. Số nghiệm thực của phương trình \({{f}^{2}}(x)-3f(x)=-2\) là:
Tại sao uống nhiều rượu dẫn đến mất nước và khát nước?
1. Rượu làm giảm tiết ADH dẫn đến giảm hấp thụ nước ở ống thận.
2. Lượng nước không được tái hấp thụ ở thận sẽ ra ngoài theo nước tiểu.
3. Mất nước làm áp suất thẩm thấu trong máu tăng, kích thích vùng dưới đồi thị gây cảm giác khát.
4. Rượu làm giảm tiết ADH dẫn đến tăng hấp thụ nước ở ống thận.
Đáp án đúng là
Cho hàm số \({\rm{f}}({\rm{x}})\) có đồ thị như hình bên. Biết rằng một trong bốn đường thẳng sau đây là đường tiệm cận xiên của đồ thị hàm số, đường đó là đường nào?
Trong thí nghiệm giao thoa Young người ta dùng ánh sáng đơn sắc có bước sóng = 0,65 μm chiếu vào hai khe cách nhau 1 mm, khoảng cách từ hai khe đến màn là 2 m. Khoảng vân là
Đâu không phải là nhận định nói về chức năng của thị trường?
Read the following passage about urbanisation and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.
URBANISATION: A GROWING PHENOMENON
Urbanisation is the process through which cities grow, and higher populations begin to inhabit urban areas. This phenomenon has accelerated significantly over the past few decades due to various factors. One of the primary drivers is the search for better employment opportunities. In rural areas, job prospects are often limited to agriculture and small-scale industries, which might not provide sufficient income. Consequently, people migrate to cities seeking better livelihoods and living standards.
Additionally, urban areas offer more advanced educational facilities and healthcare services compared to rural regions. Many families move to cities to provide their children with higher-quality education and greater future opportunities. Access to hospitals and specialized medical services also attracts people to urban centers, especially in countries where rural healthcare is underdeveloped.
However, rapid urbanisation brings about several challenges. Overcrowding in cities can lead to inadequate housing, strained infrastructure, and increased pollution. The expansion of urban areas often results in the loss of green spaces and agricultural land, impacting food production and the environment. Governments and city planners must address these issues to ensure sustainable urban growth.
Despite these challenges, urbanisation has several positive aspects. Cities are often cultural melting pots, where diverse groups of people interact, leading to vibrant communities and innovation. The concentration of resources and talents in urban areas can drive economic growth and technological advancements.
In which paragraph does the writer discuss the benefits of urbanisation?
