The Cardiovascular System: Exploring the Heart, Blood, and Circulation
Cardiovascular System
The cardiovascular system in an adult typically contains:
- 5-6 liters of blood in men
- 4-5 liters of blood in women
Blood: A Fluid Connective Tissue
Blood is a fluid connective tissue with two main components:
1. Plasma
Plasma is the liquid matrix of blood. It has the following characteristics:
- Density slightly greater than water
- Contains dissolved proteins
2. Formed Elements
Formed elements are the cellular components of blood, including:
- Red Blood Cells (RBCs): Transport oxygen and carbon
A Comprehensive Guide to Dental Casting Waxes and Procedures
Casting Waxes: A Comprehensive Guide
Casting waxes are compositions containing various waxes with desired properties for making wax patterns to be formulated into metal castings.
Types of Casting Waxes
According to Origin:
| Natural | Synthetic |
|---|---|
| Mineral Paraffin, microcrystalline, ceresin Montan | Polyethylene waxes Polyoxyethylene glycol waxes |
| Plant Carnauba, candelilla | |
| Insect Beeswax | |
| Animal Spermaceti wax |
According to Use and Application:
- Pattern Waxes: Inlay wax, casting wax, base plate wax, carding wax, blockout wax,
Comparative Anatomy of Vertebrate Skeletal and Muscular Systems
Muscle
Connective Tissue in Muscles
1. Identify these special connective tissue terms associated with muscles: fascia, raphe, tendons & myosepta.
- Fascia: Helps distribute blood vessels throughout the muscle.
- Raphe: A line of connective tissue that serves as a connection point between muscles.
- Tendons: Connective tissue surrounding the muscle that directly attaches muscles to bones.
- Myosepta: Connective tissues between myomers, linking them together.
Muscle Function and Classification
2. Why is it that
Read MoreGenetics, Ecology, and Food Chains: A Comprehensive Guide
Haploid Nucleus
23 chromosomes
Diploid Nucleus
46 chromosomes
Genotype
Examples: Tt, Bb, Rr
Phenotype
Example: A tall plant or a dwarf plant
Homozygous
Example: TT
Heterozygous
Example: Tt
Dominant Allele
Represented by a capital letter
Recessive Allele
Represented by a small letter
Mitosis
Mitosis is a nuclear division that produces genetically identical cells. The chromosome number is maintained by the exact duplication of chromosomes. Mitosis occurs when an organism is growing, repairing a damaged part of its
Read MoreUnderstanding Viruses: From Structure and Infection to Immunity
Viruses and their Life Cycles
What are Viruses?
Viruses that infect bacteria are referred to as bacteriophages.
A virion is a complete, extracellular virus particle.
The protein projections on the surface of a virus that are involved in attachment to the host cell are called spikes.
Stages of a Phage Infection
- Attachment
- Penetration
- Transcription
- Replication of nucleic acid and protein
- Assembly
- Release
The bacterial viruses that are released by a process termed extrusion are called filamentous phages.
Animal
Read MoreIntroduction to Cell Biology
The Cell Theory
- All living things are composed of one or more cells.
- Cells are the basic unit of structure and function in an organism.
- Cells come only from the reproduction of existing cells.
Prokaryote
No Nucleus / Very small / Limited organization / No membrane-bound organelles (only DNA and ribosomes) example: Bacteria
Eukaryote
Nucleus / Small (larger than Prokaryotes) / Organization / Membrane-bound organelles / Example: Plants and animals
Scientists and Their Contributions
- Anton van Leeuwenhoek: Invented