INTRODUCTION People have sought to know about the origins of
... Before we leave the Psilotum stem, take a look at how different the same structures look when seen in longitudinal vs. cross section: examine a prepared slide (l.s.) of the Psilotum sporangium, concentrating on the stem just below the sporangium (large, globose structure) itself. Compare the appeara ...
... Before we leave the Psilotum stem, take a look at how different the same structures look when seen in longitudinal vs. cross section: examine a prepared slide (l.s.) of the Psilotum sporangium, concentrating on the stem just below the sporangium (large, globose structure) itself. Compare the appeara ...
study guide - SchoolNotes
... -------------------------------------------------------------------------------------------------- Identify the basic characteristics of an annelid. o Body structure have a closed circulatory system in which the blood stays contained in vessels and does not come in direct contact with the tissues ...
... -------------------------------------------------------------------------------------------------- Identify the basic characteristics of an annelid. o Body structure have a closed circulatory system in which the blood stays contained in vessels and does not come in direct contact with the tissues ...
Unit 2 Summary Notes Cells, tissues and organs
... exterior of the egg, which allows the sperm to enter the egg and fuse with it. ...
... exterior of the egg, which allows the sperm to enter the egg and fuse with it. ...
1 BIO101 Objectives Unit 1 Chapter 32 1. Explain what is meant by
... Explain what is meant by “animals are Multicellular, Heterotrophic, Eukaryotic, Metazoans” Contrast eukaryotic and prokaryotic cells Examine the identifying features of animal cells including lack of cell wall and collagen cell junctions Examine 2 types of specialized animal cells, muscle and nervou ...
... Explain what is meant by “animals are Multicellular, Heterotrophic, Eukaryotic, Metazoans” Contrast eukaryotic and prokaryotic cells Examine the identifying features of animal cells including lack of cell wall and collagen cell junctions Examine 2 types of specialized animal cells, muscle and nervou ...
Three major areas of ear 1. External (outer) ear – hearing only 2
... Connective tissue membrane that vibrates in response to sound Transfers sound energy to bones of middle ear ...
... Connective tissue membrane that vibrates in response to sound Transfers sound energy to bones of middle ear ...
7-2 Science Support Document
... Previous/Future knowledge: In 5th grade (5-2.1), students recalled that the smallest unit of life was the cell and identified its major structures (including cell membrane, cytoplasm, nucleus, and vacuole). In 6th grade (6-2.1), students summarized the characteristics that all organisms share (inclu ...
... Previous/Future knowledge: In 5th grade (5-2.1), students recalled that the smallest unit of life was the cell and identified its major structures (including cell membrane, cytoplasm, nucleus, and vacuole). In 6th grade (6-2.1), students summarized the characteristics that all organisms share (inclu ...
Glossary - Hodder Education
... cornea transparent covering at the front of the eye corpus luteum glandular mass that develops from an ovarian follicle in mammals, after the ovum is discharged cotyledon the first leaf (leaves) of a seed plant, found in the embryo covalent bond bond between atoms in which electrons are shared crist ...
... cornea transparent covering at the front of the eye corpus luteum glandular mass that develops from an ovarian follicle in mammals, after the ovum is discharged cotyledon the first leaf (leaves) of a seed plant, found in the embryo covalent bond bond between atoms in which electrons are shared crist ...
Period 1/2 Textbook
... Animal cells are eukaryotic cells, meaning they have a nucleus and membrane-bound organelles They have internal membranes to divide the cell into separate compartments This is important so that: -Reactions can occur in ideal environments -Reactions in a series can occur close to one another -Enzymes ...
... Animal cells are eukaryotic cells, meaning they have a nucleus and membrane-bound organelles They have internal membranes to divide the cell into separate compartments This is important so that: -Reactions can occur in ideal environments -Reactions in a series can occur close to one another -Enzymes ...
Pelvis and Contents - Fisiokinesiterapia
... Oogonia begin Meiosis I are called primary oocytes (2n) Meiosis I is stalled before birth During ovulation, Meiosis I completed and Meiosis II begins Once Meiosis II begins, primary oocytes now called secondary oocytes (n) • Meiosis II is completed when sperm penetrates egg • When Meiosis II is comp ...
... Oogonia begin Meiosis I are called primary oocytes (2n) Meiosis I is stalled before birth During ovulation, Meiosis I completed and Meiosis II begins Once Meiosis II begins, primary oocytes now called secondary oocytes (n) • Meiosis II is completed when sperm penetrates egg • When Meiosis II is comp ...
The Female Reproductive System
... • The primordial follicle, directed by the oocyte, becomes a primary follicle • Primary follicle becomes a secondary follicle – The theca folliculi and granulosa cells cooperate to produce estrogens – The zona pellucida forms around the oocyte – The antrum is formed ...
... • The primordial follicle, directed by the oocyte, becomes a primary follicle • Primary follicle becomes a secondary follicle – The theca folliculi and granulosa cells cooperate to produce estrogens – The zona pellucida forms around the oocyte – The antrum is formed ...
Respiratory System
... THE LUNGS - reside in the thoracic cavity and are separated by the mediastinum; the right lung has 3 lobes and the left has 2 lobes VISCERAL PLEURA - serous membrane that directly attaches to the lungs and folds back to form the parietal pleura PLEURAL CAVITY - not a real cavity - serous fluid resi ...
... THE LUNGS - reside in the thoracic cavity and are separated by the mediastinum; the right lung has 3 lobes and the left has 2 lobes VISCERAL PLEURA - serous membrane that directly attaches to the lungs and folds back to form the parietal pleura PLEURAL CAVITY - not a real cavity - serous fluid resi ...
What do these animals have in common?
... Body form One body form may be more often seen than the other. In jellyfishes, the medusa form is usually observed. ...
... Body form One body form may be more often seen than the other. In jellyfishes, the medusa form is usually observed. ...
Extra Embryonic Membranes E
... In vertebrate embryonic development, only a part of the egg or the cleavage mass of cells forms the actual embryo, while other parts lying outside the embryonic territory develop into extra-embryonic regions, called embryonic or foetal membranes. Embryonic membranes are auxiliary organs, which have ...
... In vertebrate embryonic development, only a part of the egg or the cleavage mass of cells forms the actual embryo, while other parts lying outside the embryonic territory develop into extra-embryonic regions, called embryonic or foetal membranes. Embryonic membranes are auxiliary organs, which have ...
EXCRETION
... The kidney is divided into three distinct regions. The outermost layer is the cortex, which consists of filtering structures called nephrons. The middle layer, the medulla, consists of collecting ducts, which drain the urine from the nephrons. The inner area is the pelvis, where urine is drained fro ...
... The kidney is divided into three distinct regions. The outermost layer is the cortex, which consists of filtering structures called nephrons. The middle layer, the medulla, consists of collecting ducts, which drain the urine from the nephrons. The inner area is the pelvis, where urine is drained fro ...
chapter 32 - Scranton Prep Biology
... No cell walls are present, but animals do have intercellular junctions: desmosomes,gap junctions, and tight junctions. Highly differentiated body cells which are organized into tissues, organs and organ systems for such specialized functions as digestion, internal transport, gas exchange,movement, c ...
... No cell walls are present, but animals do have intercellular junctions: desmosomes,gap junctions, and tight junctions. Highly differentiated body cells which are organized into tissues, organs and organ systems for such specialized functions as digestion, internal transport, gas exchange,movement, c ...
Organs of the Respiratory System
... ▫ But, as tubes become smaller, cartilage lessons and smooth muscle becomes more prominent ...
... ▫ But, as tubes become smaller, cartilage lessons and smooth muscle becomes more prominent ...
BIOL 2015 – Evolution and Diversity
... quantities of different kinds of food. Much of the diversity evident in animals comes from different ways animals have evolved to obtain food. Animals are multicellular heterotrophs. That is, they are made of many cells and they don’t make their own food. The simplest animals, the sponges, do not ...
... quantities of different kinds of food. Much of the diversity evident in animals comes from different ways animals have evolved to obtain food. Animals are multicellular heterotrophs. That is, they are made of many cells and they don’t make their own food. The simplest animals, the sponges, do not ...
Pelvis and Contents
... Oogonia begin Meiosis I are called primary oocytes (2n) Meiosis I is stalled before birth During ovulation, Meiosis I completed and Meiosis II begins Once Meiosis II begins, primary oocytes now called secondary oocytes (n) • Meiosis II is completed when sperm penetrates egg • When Meiosis II is comp ...
... Oogonia begin Meiosis I are called primary oocytes (2n) Meiosis I is stalled before birth During ovulation, Meiosis I completed and Meiosis II begins Once Meiosis II begins, primary oocytes now called secondary oocytes (n) • Meiosis II is completed when sperm penetrates egg • When Meiosis II is comp ...
28-1 Levels of Organization
... a. Specialized cells develop from a single zygote. • Organisms are made up of specialized cells. ...
... a. Specialized cells develop from a single zygote. • Organisms are made up of specialized cells. ...
Answers to WHAT DID YOU LEARN questions
... ducts of the lobules merge and form 10–20 larger channels called lactiferous ducts. As each lactiferous duct approaches the nipple, its lumen expands to form a lactiferous sinus where milk is stored prior to release from the nipple. ...
... ducts of the lobules merge and form 10–20 larger channels called lactiferous ducts. As each lactiferous duct approaches the nipple, its lumen expands to form a lactiferous sinus where milk is stored prior to release from the nipple. ...
Reproductive System Part B
... They are surrounded by a fibrous tunica albuginea, which is covered by a layer of epithelial cells called the germinal epithelium Embedded in the ovary cortex are ovarian follicles ...
... They are surrounded by a fibrous tunica albuginea, which is covered by a layer of epithelial cells called the germinal epithelium Embedded in the ovary cortex are ovarian follicles ...
USMLE MAY 14
... stage, are slightly larger and contain a central oocyte surrounded by one or several cuboidal follicular cells. When several small spaces in the follicular mass fuse to form the antrum (follicular cavity), the follicle is termed a secondary follicle (choice E). ...
... stage, are slightly larger and contain a central oocyte surrounded by one or several cuboidal follicular cells. When several small spaces in the follicular mass fuse to form the antrum (follicular cavity), the follicle is termed a secondary follicle (choice E). ...
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.