Human Circulatory and Respiratory Systems: Functions & Anatomy
The Circulatory System
The circulatory system is responsible for transporting substances throughout the body. It consists of:
- A pump (the heart)
- A liquid (blood)
- A series of ducts (blood vessels)
The heart pumps blood throughout the body, delivering oxygen and nutrients to cells while collecting tissue debris and carbon dioxide.
Composition of Blood
Blood consists of:
- Plasma: A thick, yellowish liquid primarily composed of water and other substances.
- Blood cells:
- Red blood cells: Cells that have lost their
Cell Secretion: Mechanisms, Types, and Glandular Organization
Cell Secretion: An Overview
Cell secretion is the process by which cells synthesize and release specific substances into their internal or external environment to perform various functions. This process is primarily carried out by epithelial cells, which form glandular epithelia. However, non-epithelial cells can also secrete substances such as the interstitial extracellular matrix, histamine, or antibodies. Some cells produce materials for their own use, and organs like the gonads, bone marrow,
Read MoreUnderstanding Ecosystems: Structure, Function, and Services
Ecosystem Structure and Function
You have looked at the various components of the environment – abiotic and biotic. You studied how the individual biotic and abiotic factors affected each other and their surroundings. Let us look at these components in a more integrated manner and see how the flow of energy takes place within these components of the ecosystem. Interaction of biotic and abiotic components results in a physical structure that is characteristic for each type of ecosystem. Identification
Read MoreInterleukin Family: Roles and Functions
- IL-1: Produced by macrophages and epithelial cells, IL-1 induces the acute phase response. It activates T cells and macrophages, contributing to immune response development. IL-1 works alongside TNF in innate immunity and inflammation.
- IL-2: Produced by Th1 cells, IL-2 stimulates the growth and differentiation of T lymphocytes.
- IL-3: Produced by Th2 lymphocytes, IL-3 stimulates stem cells from bone marrow.
- IL-4: Involved in the proliferation of B cells, mast cells, and T lymphocytes. IL-4 plays a crucial
Understanding Genome Mutations, Mutagens, and Evolution
Genome Mutations
Genome mutations affect the number of chromosomes characteristic of a species. These mutations appear to be related to abnormal segregation of chromosomes during meiotic division. We distinguish two types: aneuploidy and euploidy.
Aneuploidy
Aneuploidy consists of a change in the number of chromosomes by gain or loss of one or more of them. There are several types:
- Nullisomy: Missing a pair of homologous chromosomes (2n-2 chromosomes).
- Monosomy: Missing a single chromosome (2n-1 chromosome)
Gene Therapy Risks & Food Production with Microorganisms
Risks of Gene Therapy
The risks associated with gene therapy include:
- Undesirable health effects (e.g. cancers, death)
- If gene insertion occurs in the wrong location, it may affect the functioning of pre-existing genes that are vital within the genome.
- Viral vectors may infect healthy cells or tissues.
- Virus may revert to original form (mutate) and become pathogenic.
- Virus entry may trigger an immune response, leading to inflammation, toxicity, and organ failure.
- Treatment must be repeated at regular intervals,