The Immune System, HIV/AIDS, and the Respiratory System: A Comprehensive Overview
4 Phagocytic Leucocytes and Pathogen Ingestion
Phagocytes, found in the blood and body tissues, play a crucial role in the immune system. They identify and engulf pathogens through endocytosis. Lysosomes, enzymes within phagocytes, then break down these pathogens. Phagocytes can move through capillary pores, allowing them to ingest pathogens both in the bloodstream and within tissues.
5 Antigens vs. Antibodies
Antibodies are proteins that defend the body against pathogens. They bind to antigens, foreign
Read MoreFetal Development: Cognitive Functioning and Learning
Fetal Development: Cognitive Functioning and Fetal Learning
Prenatal Development
The case for 9 months in a pattern that is not uniform. Throughout this period, changes of varying intensity and importance occur. The periods during which prenatal life is conventionally divided are: conception, zygote (development until the 2nd week), embryo (3rd-8th week), and fetus (9th to 38th week).
Phases of Development
Conception
Every 28 days, an egg leaves the ovary and travels to the uterus through the fallopian
Read MoreUnderstanding the Plasma Membrane and Cellular Transport
V. Plasma Membrane and Homeostasis
1. Plasma Membrane Composition
The plasma membrane is a crucial component of all cells, forming a barrier between the internal environment and the external surroundings. It’s primarily composed of a phospholipid bilayer, with each phospholipid molecule having a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails. This arrangement creates a selectively permeable barrier that regulates the passage of substances in and out of the cell.
Drawing of
Read MoreUnderstanding Energy in Living Organisms: ATP, ADP, and Cellular Processes
Energy
(Physics) The Capacity of a Physical System to Do Work
Needed by all living things.
What are the cells busy using energy for when you are sleeping?
The cells use energy to build new molecules and get rid of wastes.
What would happen if cells didn’t have the ability to get and use energy?
The cells would die.
What are 3 forms of energy?
Light, heat, and electricity.
Chemical Bond
An attractive force that holds together the atoms, ions, or groups of atoms in a molecule or compound.
Where is chemical energy
Read MoreUnderstanding Cell Biology: Structure, Function, and Division
Cell Biology
Introduction
Cells are the fundamental building blocks of all living organisms, serving as the basic units of structure and function. Just as bricks form a house, cells work together to create complex organisms. Each cell is capable of carrying out essential life processes such as reproduction, respiration, excretion, and growth. In unicellular organisms, a single cell performs all these functions, while in multicellular organisms, cells specialize and cooperate to maintain life.
Discovery
Read MoreRenal Physiology, Hormones, and Digestive Processes
Renal Hormones and Bicarbonate Reabsorption
Hormones Increasing Renal Na+ Reabsorption
1. Aldosterone
Stimulates Na+ reabsorption in principal cells of the distal convoluted tubule (DCT) and cortical collecting duct (CD) in exchange for K+.
Mechanism of Action: New protein synthesis (slow onset: 30 minutes to 2 hours). Increases the number of Na+ channels in the luminal membrane and Na+-K+ ATPase in the basolateral membrane of principal cells.
2. Angiotensin II
- Stimulates aldosterone secretion.
- In the