The main reason lies in the fact that a mammal's gills would have to be gigantic. Gills work for fish because fish, being cold-blooded, don't need that much oxygen. A typical warm-blooded human being might require 15 times moreoxygenper pound of body weight than a cold-blooded fish. ...
A.Two chemical molecules on the red blood cells. 1. **选项A分析**:人类ABO血型系统的差异由红细胞表面的抗原类型决定。A抗原和B抗原是两种不同的糖蛋白或糖脂类化学分子,其存在与否直接决定血型分类(如A型有A抗原,B型有B抗原,AB型两者都有,O型两者皆无)。此选项正确。2. **选项B分析**:白细胞上的化...
including Knit to Quit to help smokers give up the habit, and Knit to Heal for people coping with health crises, like a cancer diagnosis or serious illness of a family member. Schools and prisons with craft programs report that they have a calming eff...
A team of researchers from Tulane University, in their article “High Blood Pressure and Cardiovascular Disease” published in the Journal of Hypertension, highlights that abnormal blood pressure readings, whether high or low, in systolic or diastolic measurements, can signal potential health issues. T...
popular in Cihapa.D What's your blood type(血型)? As we know there are four main blood types: A. B. O. and AB The letters refer to two kinds of antigens(抗原).A and B. People with typc- A B blood have both antigens those with type- A or type- B have only one, and p...
of elderly people, we can tap into their extensive expertise and experience ,and benefit from their insights, thus enriching our whole communities.Secondly, elderly people have made significant contributions to society throughout their ...
Japanese people often ask people what blood group(血型) they are.This is (1)___ they believe that a person's blood group says a lot about their character and personality.The Japanese also believe that (2)___(know) blood group can help them decide that if a person will be a person'...
People with blood group O-positivecan donate blood to not only other O-positive peoplebut alsoall other positiveblood types(including A+, B+, and AB+). More than 80 percent of people have a positive blood type, making O-positive blood in high demand. It is, thus, also the blood type...
slowly through the big thoroughfares. she leaned against her father, who held her in his arm, as she stared out of the window at the passing people with a queer (strange, odd) old-fashioned thoughtfulness in her ...
When people eat more healthfully, 3. ___ (quit) smoking, and manage stress better, they find they feel so much better, so quickly. It reconstructs the reason for making these changes from fear of dying to joy of living.When you exercise and eat right, your brain receives more blood ...