Oogenesis 9 3 Female reproductive cycles 12 Ovarian cycle 12 Menstrual cycle 15 4 Fertilization 18 Contraceptive methods 20 Infertility 21 Cloning 23 5 Early embryonic development 24 Cleavage of zygote 24 Implantation 25 Bilaminar germ disc 27 6 Trilaminar embryo 29 7 Early tissue and organ differentiation 32 Folding
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most important systems in the body is the lymphatic system. One of many functions in the lymphatic system is to cleanse leaked plasma of bacteria and other foreign substances and return it to the blood stream. This also acts as a surveillance system for immune system cells. Another function of the lymphatic system is to stop or slow pathogen entry‚ prevent disease-causing microorganisms from spreading and to strengthen the response of the immune system. Also‚ the lymphatic system protects against
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Excretory system DEFINITION The excretory system is a passive biological system that removes excess‚ unnecessary materials from an organism‚ so as to help maintain homeostasis within the organism and prevent damage to the body. It is responsible for the elimination of the waste products of metabolism as well as other liquid and gaseous wastes‚ as urine and as a component of sweat and exhalation. As most healthy functioning organs produce metabolic and other wastes‚ the entire organism depends on the
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An overview of the nervous and endocrine systems‚ their functions and how together they regulate homeostasis The endocrine system is the internal system of the body that deals with chemical communication by means of hormones‚ the ductless glands that secrete the hormones‚ and those target cells that respond to hormones. The endocrine system functions in maintaining the basic functions of the body ranging from metabolism to growth. The endocrine system functions in long term behavior and works
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The endocrine system is a control system of ductless glands that secrete chemical "instant messengers" called hormones that circulate within the body via the bloodstream to affect distant cells within specific organs. Endocrine glands secrete their products immediately into the blood or interstitial fluid‚ without storage of the chemical. Hormones act as "messengers‚" and are carried by the bloodstream to different cells in the body‚ which interpret these messages and act on them. Typical endocrine
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Purpose The digestive system prepares food for use by hundreds of millions of body cells. Food when eaten cannot reach cells (because it cannot pass through the intestinal walls to the bloodstream and‚ if it could would not be in a useful chemical state. The gut modifies food physically and chemically and disposes of unusable waste. Physical and chemical modification (digestion) depends on exocrine and endocrine secretions and controlled movement of food through the digestive tract. Mouth Mouth
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information about humans’ circulatory system. One of the most important systems our body has if not THE most important since one of its organs is the heart. We will focus on senior citizens. As we age‚ our organs’ working mechanism becomes slower and our muscles tend to be less flexible or elastic and that is why we think the information we will provide‚ will be very useful. Some of the talking points will be: • General function of the system and how the organ system contributes to physiological homeostasis
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CARDIOVASCULAR SYSTEM OF THE HEAD NECK The cardiovascular system consists of the heart‚ blood vessels‚ and the approximately 5 liters of blood that the blood vessels transport. Responsible for transporting oxygen‚ nutrients‚ hormones‚ and cellular waste products throughout the body‚ the cardiovascular system is powered by the body’s hardest-working organ — the heart‚ which is only about the size of a closed fist. Even at rest‚ the average heart easily pumps over 5 liters of blood throughout
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Circulatory system From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search This article is about the organ system. For the band‚ see Circulatory System. For transport in plants‚ see Vascular tissue. Circulatory system | | The human circulatory system. Red indicates oxygenated blood‚ blue indicates deoxygenated. | Latin | systema cardiovasculare | The circulatory system is an organ system that passes nutrients (such as amino acids‚ electrolytes and lymph)‚ gases‚ hormones
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The Systems and Language Skills of English 1. The best teachers are the confident and prepared teachers. To be a successful English teacher you need a good knowledge of the topic. Clearly‚ communication with students is essential in effective teaching. To communicate successfully‚ teachers must know how to structure their own language for maximum clarity and have strategies for understanding what students are saying since understanding student talk is key to analysis of what students know
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