Question

Скелет птиц ____и ________, кости ______. У птиц наиболее развиты большие грудные мышцы, _________ крылья. Они прикрепляются к ________ и к плечевой кости. Грудные мышцы хороших летунов составляют 1/5 часть массы их тела. Под большими грудными мышцами расположены подключичные мышцы. Они поднимают крылья. Сердце птиц __________, кругов кровообращения -______. Из органов чувств у птиц очень хорошее ____ и ______, они различают цвета; чаще всего слабое _______ и ______ Список слов: зрение, слух, вкус, прочный, обоняние, четырехкамерное, трехкамерное, два , один, легкий, полые, опускающие, киль грудины

Answer 1

Ответ:

Легкий, прочный, полые, опускающие, киль грудины, трехкамерное, два, зрение и слух, обоняние и вкус

Answer 2

The Skeleton of Birds

The skeleton of birds is unique and adapted for flight. Birds have lightweight and hollow bones, which help reduce their overall weight and make it easier for them to fly. The bones of birds are also highly modified to support the development of large chest muscles and wings. These adaptations allow birds to generate the necessary lift and power for flight.

Chest Muscles and Wings

Birds have well-developed chest muscles, specifically the pectoral muscles, which are responsible for powering the wings during flight. These muscles make up a significant portion of a bird's body mass, typically around 1/5th of their total body weight. The pectoral muscles are attached to the breastbone (sternum) and the shoulder bone (humerus), providing the necessary strength and range of motion for wing movement.

Additional Muscles for Wing Movement

In addition to the pectoral muscles, birds also have muscles called the supracoracoideus muscles, commonly known as the supracoracoides. These muscles are located beneath the pectoral muscles and are responsible for raising the wings during flight. The supracoracoides muscles work in conjunction with the pectoral muscles to provide the necessary power and control for wing flapping.

The Bird's Circulatory System

The circulatory system of birds is highly efficient and adapted for the demands of flight. Birds have a four-chambered heart, similar to mammals, which allows for efficient separation of oxygenated and deoxygenated blood. This enables birds to have a high metabolic rate and meet the oxygen demands required for sustained flight.

Sensory Organs in Birds

Birds have well-developed sensory organs, particularly in the areas of vision and hearing. Their vision is highly acute, and they are capable of distinguishing colors. Birds often have a weak sense of smell, but their sense of taste is generally well-developed. They also have a good sense of touch, particularly in their feet, which helps them navigate and grasp objects.

In summary: - The skeleton of birds is adapted for flight, with lightweight and hollow bones. - Birds have well-developed chest muscles (pectoral muscles) that power their wings during flight. - Additional muscles (supracoracoides) assist in raising the wings during flight. - Birds have a four-chambered heart, enabling efficient oxygenation of blood. - Birds have excellent vision, good taste, and a weak sense of smell.

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