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Chapter 3 - Pelican Rapids School
Chapter 3 - Pelican Rapids School

... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
Connective Tissue
Connective Tissue

... More than one cell layer ...
Chapter 5: Tissues
Chapter 5: Tissues

... 3. Bone functions to support body structures, protest vital structures of the cranial and thoracic cavities, and as attachment sites for muscles. It also stores inorganic salts and produces blood cells. 4. Bone cells are osteocytes. 5. Lamella are thin layers of bone formed by osteocytes. 6. Osteoc ...
Plant Structure and Function
Plant Structure and Function

... 2. The root apical meristem is the region protected by the root cap, a protective cover; its cells are replaced constantly because they are soon ground off. 3. The primary meristems are in the zone of cell division, which continuously provides cells to the zone of elongation by mitosis. 4. The zone ...
File
File

... ◦ Blood flows from the right atrium to the right ventricle through the cusps of the right atrioventricular valve known as the tricuspid valve. ◦ The tricuspid valve is attached by long tendons called chordae tendineae to the papillary muscles. ◦ When the right ventricle contracts, the tricuspid clos ...
File
File

... ◦ Blood flows from the right atrium to the right ventricle through the cusps of the right atrioventricular valve known as the tricuspid valve. ◦ The tricuspid valve is attached by long tendons called chordae tendineae to the papillary muscles. ◦ When the right ventricle contracts, the tricuspid clos ...
Sponges and Cnidarians
Sponges and Cnidarians

... persisted on Earth for more than half a billion years. Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. The limit of this type of digestion is that food particles must be smaller than individual cells. Gas exchange ...
Neural Crest Cells
Neural Crest Cells

... includes head and face and tissues responsible for teeth development differentiation of nervous tissue from ectoderm differentiation of neural crest cells (ectoderm) differentiation of mesoderm ...
histology / tissue level of organization
histology / tissue level of organization

... • Forms both the external and internal lining of many organs. • Constitutes the majority of glands. • Composed of one or more layers of closely packed cells that form a barrier between two compartments having different components. • Little to no extracellular matrix. • No blood vessels penetrate an ...
Chapter 03
Chapter 03

... Coelomate animals possess a coelom (a fluid-filled body cavity that is completely lined with mesoderm) • e.g. annelids, arthropods, mollusks, echinoderms, chordates ...
4.20.05 Histology and Digestion
4.20.05 Histology and Digestion

... brain, spinal cord, and nerves, receives and processes information, and causes the body to react to stimuli; the nervous system regulates the activities of the other organ systems of the body. • The endocrine system consists of hormone-secreting glands, helps to regulate the functioning of other bod ...
Levels of Organization ppt
Levels of Organization ppt

... Excretory System Functions: Removes liquid and solid wastes from the body Organs: kidney, colon, spleen Tissue: smooth muscle ...
The Biology Staff Handbook - St. Mary`s Independent School
The Biology Staff Handbook - St. Mary`s Independent School

... In industry: o Proteases are used to pre-digest the protein in some baby foods.  This reduces how much the baby needs to digest the food. o Carbohydrases are used to convert starch into sugar syrup.  This is cheaper than extracting sugar from sugar cane. o Isomerase is used to convert glucose syru ...
Document
Document

... Body cavity and digestive tube (inner tube) Kidneys and gonads – deep to body wall ...
Week 9 Follow-Along Sheet File
Week 9 Follow-Along Sheet File

...  Contain anterior/posterior, ventral/dorsal areas of the body  _____________________ has evolved  Resulting in use of their head for orientation  ______________________:  3 germ layers (Ecto-, Meso-, Endoderm)  We will talk about:  Phylum Platyhelminthes  Phylum Rotifera  Phylum Nematoda  ...
Biology - H Hungary is already a member of EU system so you can
Biology - H Hungary is already a member of EU system so you can

... The Golgi apparatus consists of a stack of membrane-bounded cisternae located between the endoplasmic reticulum and the cell surface. A myriad of enzymes (proteins) are present in the Golgi to perform its various synthetic activities. ...
Chapter 1 - The Science of Biology - holyoke
Chapter 1 - The Science of Biology - holyoke

... insane, but people marooned at sea will speed up dehydration (and death) by drinking sea water. This is also why "salting fields" was a common tactic during war, it would kill the crops in the field, thus causing food shortages. Diffusion and Osmosis are both types of PASSIVE TRANSPORT - that is, no ...
Respiratory system notes fill
Respiratory system notes fill

...  Description: Structures made up of __________ _________________ epithelium surrounded by blood capillaries  Function: ________________________________ Respiratory membrane – extremely thin membrane that aids in the rapid exchange of gases Gas crosses the respiratory membrane by ___________ o __ ...
Integumentary System ppt
Integumentary System ppt

... • Some organisms, such as insects, and ...
bioproject
bioproject

... to the heart. They have valves that prevent blood from flowing back. They are located nearer to the skin and are more visible than arteries. Veins have a structure much like arteries, allowing them to transfer large volumes of blood, without bursting. ...
Cell Differentiation
Cell Differentiation

... Adult Stem Cells For years, biologists have suspected that adult organisms might also contain some types of stem cells. Cells in the blood and skin, for example, have a limited life span and must be constantly replaced. This suggests that the body contains pools of stem cells from which new skin and ...
File
File

... ATP hydrolysis and cross bridge formation are necessary for the filaments to slide. ...
Taste sensation from the oral part (anterior two
Taste sensation from the oral part (anterior two

... Between the inner nuclear layer and the outer nuclear layer Between the choriocapillaris and the pigment epithelial layer Between the pigment epithelial layer and the layer of outer segments of rods and cones ...
Mindy
Mindy

... All other body systems may be present, but humans would essentially be nothing except for a body if not for the nervous system, which, by responding to stimulus from both the outside and inside of the body allows for proper, healthy function. The nervous system processes this information to help a p ...
Taste sensation from the oral part (anterior two
Taste sensation from the oral part (anterior two

... Between the inner nuclear layer and the outer nuclear layer Between the choriocapillaris and the pigment epithelial layer Between the pigment epithelial layer and the layer of outer segments of rods and cones ...
< 1 ... 56 57 58 59 60 61 62 63 64 ... 165 >

Human embryogenesis



Human embryogenesis is the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, human development entails growth from a one celled zygote to an adult human being. Fertilisation occurs when the sperm cell successfully enters and fuses with an egg cell (ovum). The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences. Embryogenesis covers the first eight weeks of development and at the beginning of the ninth week the embryo is termed a fetus.Human embryology is the study of this development during the first eight weeks after fertilisation. The normal period of gestation (pregnancy) is nine months or 38 weeks.The germinal stage, refers to the time from fertilization, through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days.During this stage, the zygote, which is defined as an embryo because it contains a full complement of genetic material, begins to divide, in a process called cleavage. A blastocyst is then formed and implanted in the uterus. Embryogenesis continues with the next stage of gastrulation when the three germ layers of the embryo form in a process called histogenesis, and the processes of neurulation and organogenesis follow. The embryo is referred to as a fetus in the later stages of prenatal development, usually taken to be at the beginning of the ninth week. In comparison to the embryo, the fetus has more recognizable external features, and a more complete set of developing organs. The entire process of embryogenesis involves coordinated spatial and temporal changes in gene expression, cell growth and cellular differentiation. A nearly identical process occurs in other species, especially among chordates.
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