这页已由机器翻译。其他页面可能仍然显示为英文。
View in English
黄热病的复发
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
相关概念视频
1.3K
Fever can be triggered by several factors, including infections, nervous system disorders, certain cancers, blood diseases like leukemia, embolism, thrombosis, heatstroke, dehydration, surgical trauma, crushing injuries, and allergic reactions.
Here are the different types of fever:
• Rigor: This type of fever is characterized by a sudden and severe attack of shivering, during which body temperature quickly rises to hyperpyrexia levels.
• Hyperthermia: Occurs when the body...
3.9K
Before understanding the types and patterns of fever, it is essential to know its phases.
• The first stage is the onset/invasion phase, during which the body temperature rises. It might be a sudden or gradual process.
• The second stage is the steady phase, during which the body temperature has reached its maximum and remains constant at a high level.
• The third stage is the defervescence or decline phase, during which the elevated temperature returns to...
1.4K
The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
Suppose a bacterial infection is the cause of fever. In that case, the healthcare provider obtains culture specimens...
81.3K
Overview
To determine whether traits are inherited together or separately, Gregor Mendel crossed pea plants that differed in two traits. These parental plants were homozygous for both traits but displayed different phenotypes. The first generation of offspring were all dihybrids, heterozygotes exhibiting the two dominant phenotypes. When self-fertilized, the dihybrids consistently produced progeny with a 9:3:3:1 ratio of four possible phenotype combinations. This ratio suggested that...
239.6K
Overview
In the 1850s and 1860s, Gregor Mendel investigated inheritance by performing monohybrid crosses in pea plants. He crossed two plants that were true-breeding for different traits. Based on his observations, Mendel proposed that organisms inherit two copies of each trait, one from each parent, and that dominant traits can hide recessive traits. These results formed the basis of two fundamental principles in genetics: the Principle of Uniformity and the Law of Segregation.
Monohybrid...
129.5K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
The Theory of Natural...