Danh sách bài viết của Lê Thị Khánh Huyền

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Bài viết của Lê Thị Khánh Huyền

Sound Intensity and Sound Level

Noise on crowded roadways like this one in Delhi makes it hard to hear others unless they shout. (credit: Lingaraj G J, Flickr) In a quiet forest, you can sometimes hear a single leaf fall to the ground. After settling into bed, you ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Maternal Changes During Pregnancy, Labor, and Birth

A full-term pregnancy lasts approximately 270 days (approximately 38.5 weeks) from conception to birth. Because it is easier to remember the first day of the last menstrual period (LMP) than to estimate the date of conception, obstetricians set the due date as ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

The Central Nervous System

The brain and the spinal cord are the central nervous system, and they represent the main organs of the nervous system. The spinal cord is a single structure, whereas the adult brain is described in terms of four major regions: the cerebrum, the diencephalon, ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Animal Primary Tissues

The tissues of multicellular, complex animals are four primary types: epithelial, connective, muscle, and nervous. Recall that tissues are groups of similar cells group of similar cells carrying out related functions. These tissues combine to form organs—like ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Systems of Gas Exchange

The primary function of the respiratory system is to deliver oxygen to the cells of the body’s tissues and remove carbon dioxide, a cell waste product. The main structures of the human respiratory system are the nasal cavity, the trachea, and lungs. All ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Introduction: Further Applications of Newton’s Laws

Total hip replacement surgery has become a common procedure. The head (or ball) of the patient’s femur fits into a cup that has a hard plastic-like inner lining. (credit: National Institutes of Health, via Wikimedia Commons) ...

Tác giả: Lê Thị Khánh Huyền viết 14:53 ngày 25/05/2018 chỉnh sửa

The Parathyroid Glands

The parathyroid glands are tiny, round structures usually found embedded in the posterior surface of the thyroid gland ([link]). A thick connective tissue capsule separates the glands from the thyroid tissue. Most people have four parathyroid glands, but ...

Tác giả: Lê Thị Khánh Huyền viết 14:53 ngày 25/05/2018 chỉnh sửa

Electric Field Lines: Multiple Charges

Drawings using lines to represent electric fields around charged objects are very useful in visualizing field strength and direction. Since the electric field has both magnitude and direction, it is a vector. Like all vectors , the electric field can be ...

Tác giả: Lê Thị Khánh Huyền viết 14:53 ngày 25/05/2018 chỉnh sửa

Cancer and the Cell Cycle

Cancer comprises many different diseases caused by a common mechanism: uncontrolled cell growth. Despite the redundancy and overlapping levels of cell cycle control, errors do occur. One of the critical processes monitored by the cell cycle checkpoint ...

Tác giả: Lê Thị Khánh Huyền viết 14:53 ngày 25/05/2018 chỉnh sửa

The Wave Nature of Matter Causes Quantization

After visiting some of the applications of different aspects of atomic physics, we now return to the basic theory that was built upon Bohr’s atom. Einstein once said it was important to keep asking the questions we eventually teach children not to ...

Tác giả: Lê Thị Khánh Huyền viết 14:53 ngày 25/05/2018 chỉnh sửa

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Sound Intensity and Sound Level

Maternal Changes During Pregnancy, Labor, and Birth

The Central Nervous System

Animal Primary Tissues

Systems of Gas Exchange

Introduction: Further Applications of Newton’s Laws

The Parathyroid Glands

Electric Field Lines: Multiple Charges

Cancer and the Cell Cycle

The Wave Nature of Matter Causes Quantization

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