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Bài viết của Nguyễn Mỹ Hương

Mammalian Heart and Blood Vessels

The heart is a complex muscle that pumps blood through the three divisions of the circulatory system: the coronary (vessels that serve the heart), pulmonary (heart and lungs), and systemic (systems of the body), as shown in [link]. Coronary circulation ...

Tác giả: Nguyễn Mỹ Hương viết 14:59 ngày 25/05/2018 chỉnh sửa

Approaches to Sociological Research

When sociologists apply the sociological perspective and begin to ask questions, no topic is off limits. Every aspect of human behavior is a source of possible investigation. Sociologists question the world that humans have created and live in. They ...

Tác giả: Nguyễn Mỹ Hương viết 14:59 ngày 25/05/2018 chỉnh sửa

Anatomy and Physiology of the Male Reproductive System

Unique for its role in human reproduction, a gamete is a specialized sex cell carrying 23 chromosomes—one half the number in body cells. At fertilization, the chromosomes in one male gamete, called a sperm (or spermatozoon), combine with the chromosomes ...

Tác giả: Nguyễn Mỹ Hương viết 14:59 ngày 25/05/2018 chỉnh sửa

Green Algae: Precursors of Land Plants

Until recently, all photosynthetic eukaryotes were considered members of the kingdom Plantae. The brown, red, and gold algae, however, have been reassigned to the Protista kingdom. This is because apart from their ability to capture light energy and fix CO 2 ...

Tác giả: Nguyễn Mỹ Hương viết 14:58 ngày 25/05/2018 chỉnh sửa

Human Reproductive Anatomy and Gametogenesis

As animals became more complex, specific organs and organ systems developed to support specific functions for the organism. The reproductive structures that evolved in land animals allow males and females to mate, fertilize internally, and support the growth ...

Tác giả: Nguyễn Mỹ Hương viết 14:58 ngày 25/05/2018 chỉnh sửa

Pressures in the Body

Next to taking a person’s temperature and weight, measuring blood pressure is the most common of all medical examinations. Control of high blood pressure is largely responsible for the significant decreases in heart attack and stroke ...

Tác giả: Nguyễn Mỹ Hương viết 14:58 ngày 25/05/2018 chỉnh sửa

Preface to Biology

Welcome to Biology , an OpenStax College resource. This textbook has been created with several goals in mind: accessibility, customization, and student engagement—all while encouraging science students toward high levels of academic scholarship. ...

Tác giả: Nguyễn Mỹ Hương viết 14:58 ngày 25/05/2018 chỉnh sửa

Blood Typing

Blood transfusions in humans were risky procedures until the discovery of the major human blood groups by Karl Landsteiner, an Austrian biologist and physician, in 1900. Until that point, physicians did not understand that death sometimes followed blood ...

Tác giả: Nguyễn Mỹ Hương viết 14:57 ngày 25/05/2018 chỉnh sửa

Bones of the Upper Limb

The upper limb is divided into three regions. These consist of the arm , located between the shoulder and elbow joints; the forearm , which is between the elbow and wrist joints; and the hand , which is located distal to the wrist. There are 30 bones in each ...

Tác giả: Nguyễn Mỹ Hương viết 14:57 ngày 25/05/2018 chỉnh sửa

Elastic Collisions in One Dimension

Let us consider various types of two-object collisions. These collisions are the easiest to analyze, and they illustrate many of the physical principles involved in collisions. The conservation of momentum principle is very useful here, and it can be used ...

Tác giả: Nguyễn Mỹ Hương viết 14:57 ngày 25/05/2018 chỉnh sửa