Human Body Systems: Digestion and Respiration Explained
The Importance of Nutrients and Body Systems
The cells of all organisms need nutrients to grow and function. Heterotrophic organisms, like us, can’t produce their own nutrients. They obtain them from food. Multicellular organisms have many organs. These organs are grouped together into different systems that perform diverse functions. Five important systems work together to maintain our organisms correctly: Digestive, Respiratory, Circulatory, Excretory, and Lymphatic systems.
Digestion: Breaking
Read MoreFriction, Photosynthesis, Matter, and Scientist
Friction
Newton’s Laws:
- 1st: An object remains at rest, or in motion at a constant speed in a straight line, unless acted upon by an external force.
- 2nd: Force = Mass * Acceleration
- 3rd: For every action, there is an equal and opposite reaction.
Velocity: Velocity is the speed in combination with the direction of motion of an object.
Positive Acceleration: Positive acceleration occurs when an object is speeding up in the positive direction. For example, if a car is moving forward and its velocity is increasing,
Read MoreDiaphragm: Anatomy, Function, and Attachments
The diaphragm forms the floor of the rib cage. It is a very wide, flat muscle that separates the chest wall from the abdomen. It is shaped like a dome, whose base corresponds to the lower chest girth and is wider transversely than anteroposteriorly. The convexity is related to the thoracic viscera and the concavity with the abdominal viscera.
Besides the lower attachment, the plan will lower the chest up and down, tilt the steering wheel, and move front to back.
The diaphragmatic dome rises a bit
Read MoreUnderstanding Human Biology: Cell Structure to Ecosystem Impacts
Cell Structure and Human Biology
Cell Structure
Plasma membrane, cytoplasm (ribosomes, mitochondria, endoplasmic reticulum, Golgi apparatus, vacuoles, lysosomes), nucleus (nuclear membrane, nucleoplasm, chromatin, nucleolus).
Tissues
- Epithelial: Lining epithelium (mucous membranes, endothelia, epidermis), gland (exocrine, endocrine, mixed)
- Connective: Connective tissue, adipose, cartilaginous, osseous
- Muscle: Smooth, striated, cardiac
- Nerves: Neurons, glial cells
Body Organization
Structures formed by various
Read MoreUnderstanding Nutrition, Stimuli, and Reproduction in Living Organisms
Nutrition in Living Organisms
Living things need energy to keep the body functioning and to produce substances for growth and development. This energy is obtained from external sources; the collection of nutrients is food.
Autotrophic Nutrition
This type of nutrition is found in plants, algae, and many bacteria. Autotrophic organisms can produce their own food (organic matter) from simple substances like water and carbon dioxide (inorganic raw materials) obtained from the environment.