visceral mass

Examples of visceral mass in the following topics:

• Phylum Mollusca

  • Mollusks have a soft body and share several characteristics, including a muscular foot, a visceral mass of internal organs, and a mantle.
  • In spite of their tremendous diversity, however, they also share a few key characteristics, including a muscular foot, a visceral mass containing internal organs, and a mantle that may or may not secrete a shell of calcium carbonate .
  • The visceral mass is present above the foot in the visceral hump.

• Classification of Phylum Mollusca

  • The visceral mass in the shelled species displays torsion around the perpendicular axis on the center of the foot, which is the key characteristic of this group, along with a foot that is modified for crawling .

• Animal Characterization Based on Features of Embryological Development

  • The mesoderm, the third germ layer forming between the endoderm and ectoderm in triploblasts, gives rise to all muscle tissues (including the cardiac tissues and muscles of the intestines), connective tissues such as the skeleton and blood cells, and most other visceral organs such as the kidneys and the spleen.
  • This coelomic cavity represents a fluid-filled space that lies between the visceral organs and the body wall.
  • The coelom of most protostomes is formed through a process called schizocoely, when a solid mass of the mesoderm splits apart and forms the hollow opening of the coelom.

• The Mechanics of Human Breathing

  • The layer of tissue that covers the lung and dips into spaces is called the visceral pleura.

• Post-Cambrian Evolution and Mass Extinctions

  • The post-Cambrian era was characterized by animal evolution and diversity where mass extinctions were followed by adaptive radiations.
  • Such periods of mass extinction have occurred repeatedly in the evolutionary record of life, erasing some genetic lines while creating room for others to evolve into the empty niches left behind .
  • The end of the Permian period (and the Paleozoic Era) was marked by the largest mass extinction event in Earth's history, a loss of roughly 95 percent of the extant species at that time.
  • Another mass extinction event occurred at the end of the Cretaceous period, bringing the Mesozoic Era to an end.
  • Differentiate among the causes of mass extinctions and their effects on animal life

• Biodiversity Change through Geological Time

  • Biodiversity has been affected by five mass extinction periods, which greatly influenced speciation and extinction rates.
  • The Ordovician-Silurian extinction event is the first-recorded mass extinction and the second largest.
  • The transitions between the five main mass extinctions can be seen in the rock strata.
  • Sudden and dramatic losses of biodiversity, called mass extinctions, have occurred five times.
  • Describe how biodiversity has changed through geological time as a result of mass extinctions

• Cleavage, the Blastula Stage, and Gastrulation

  • Mammals at this stage form a structure called the blastocyst, characterized by an inner cell mass that is distinct from the surrounding blastula.
  • During cleavage, the cells divide without an increase in mass; that is, one large single-celled zygote divides into multiple smaller cells.
  • Here the cells in the blastula arrange themselves in two layers: the inner cell mass and an outer layer called the trophoblast .
  • The inner cell mass is also known as the embryoblast; this mass of cells will go on to form the embryo.
  • The rearrangement of the cells in the mammalian blastula to two layers, the inner cell mass and the trophoblast, results in the formation of the blastocyst.

• Basic Techniques in Protein Analysis

  • The basic technique for protein analysis, analogous to DNA sequencing, is mass spectrometry.
  • Mass spectrometry is used to identify and determine the characteristics of a molecule .
  • If the mass is measured with precision, then the composition of the molecule can be identified.
  • Matrix-Assisted Laser Desorbtion Ionisation - Time Of Flight (MALDI-TOF) Mass Spectrometer.
  • Mass spectrometry can be used in protein analysis.

• The Periodic Table

  • Matter comprises all of the physical objects in the universe, those that take up space and have mass.
  • Elements of the human body arranged by percent of total mass
  • Carbon, hydrogen, oxygen, and nitrogen make up approximately 96% of the mass in a human body.
  • The periodic table shows the atomic mass and atomic number of each element.
  • The atomic number appears above the symbol for the element and the approximate atomic mass appears below it.

• Cellular Differentiation

  • The blastocyst has an outer layer of cells, and inside this hollow sphere, there is a cluster of cells called the inner cell mass.
  • The cells of the inner cell mass go on to form virtually all of the tissues of the human body.
  • Although the cells of the inner cell mass can form virtually every type of cell found in the human body, they cannot form an organism.