Animal Kingdom: Characteristics, Classification & Systems
The Animal Kingdom
Characteristics of Animals
Animals are organisms that share several key characteristics:
- Eukaryotes: Their cells have a nucleus and other membrane-bound organelles.
- Heterotrophs: They obtain nutrients by consuming other organisms.
- Multicellular: They are made up of multiple cells.
- Respond quickly to stimuli: They have nervous systems that allow them to react to their environment.
- Actively moving: Most animals are capable of movement.
- Have sexual reproduction: They reproduce sexually,
Human Biology Basics: Cells, Tissues, and Organ Systems
Functions of Lymph
Lymph keeps the body cells moist. It transfers oxygen, hormones, and nutrients to different parts of the body and removes metabolic waste from the cells. It transports antibodies and lymphocytes to the blood. Lymph also maintains the composition of the tissue fluid and volume of the blood. Absorption of fat from the small intestine occurs through lymphatic vessels.
Mechanism of Breathing
The air pressure in our lungs varies during breathing. When air pressure falls, the alveolar
Human Respiratory & Circulatory Systems
Metabolism
Metabolism is the sum of chemical reactions in cells. Adenosine triphosphate (ATP) is a molecule that provides energy for muscle movement. It’s present in small quantities and lasts about 1.2 seconds. ATP is consumed and recovered through:
- Phosphocreatine: Creatine molecules that create energy. Used in anaerobic and alactic efforts (2-7 seconds).
- Anaerobic Glycolysis: Short anaerobic efforts. Lactic acid is created. Oxidation of glucose produces ATP.
- Aerobic Respiration: Long aerobic efforts.
Medical Terminology: Prefixes, Suffixes, and Abbreviations
Medical Terminology
Prefixes – Meaning (Example)
a- not/without (arrhythmia)
adipo- fat (adipose tissue)
aero- air/gas (aerodontalgia)
alge- pain (algesthesia)
an- lacking in/without (anemia)
andr- male (androgen)
angi- blood vessel (angiography)
anthropo- man/human being (anthropology)
anti- against (antisepsis)
bi- two/twice (bilateral)
bio- life (biology)
cardio- heart (cardiomyopathy)
cephalo- head (cephalhematoma)
costo- ribs (costalgia)
cyto- cell (cytology)
dent- tooth/teeth (dentistry)
dermato- skin (dermatologist)
Microbial Pathogenesis and Host Interactions: Understanding Virulence and Immune Responses
Microbial Pathogenesis and Host Interactions
The Role of Microbiota in Infection
Microbiota usually protects against infections, directly by limiting nutrients, inhibiting virulence gene expression, and killing incoming species. Indirectly, it alters the host’s innate and adaptive immune response.
The outcome of infection depends on agent factors such as strain, gene content, and expression, as well as the host’s genotype, age, history, and immunity.
Primary Pathogens
Primary pathogens can cause disease
Read MoreMicrobial Pathogenesis and Host Interactions: A Comprehensive Overview
Microbial Pathogenesis and Host Interactions
Microbiota and Infection
Microbiota usually protects against infections, directly by limiting nutrients, inhibiting virulence gene expression and killing of incoming species. Indirectly, it alters host innate and adaptive immune response.
The outcome of infection is dependent on agent factors such as strain, gene content and expression. It is also dependent on the host’s genotype, age, history and immunity.
Types of Pathogens
Primary Pathogens
Primary pathogens
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