Notes, summaries, assignments, exams, and problems for Biology

1. Bioelements O biogenic elements.

Are the chemical elements that are part of living matter. We found about 70 chemical elements forming part of living matter, these are in various proportions and not all are present in all living things. In accordance with its wealth divide:
Bioelements-primary.
Bioelements-side.

• Bioelements Primary: These are found in greater proportion, are present in all biomolecules. Represents around 95% by weight of living matter. They are the C, O, H, N and to a lesser extent P and S.
  These items have been selected among all those who constitute the Earth's crust to form living matter, although except oxygen are the most abundant, possessing features among which are the following:

1-have incomplete outer electron... Continue reading "Bioelements" »

GMO - Genetically modified organisms


Benefits and Risks
Advantages
Key benefits of biotechnology are:
·
Superior performance. By GMO crop yield increases, giving more food for fewer resources, reducing crop losses as well as environmental factors

• Reduced pesticide Whenever a GMO is modified to resist a particular pest is helping to reduce pesticide use associated with it that often cause widespread environmental damage and health. ^[

• Improved nutrition can be reached by introducing vitamins and protein on food and reduce the allergens and natural toxins. You can also try to grow in extreme conditions as auxiliaries to the countries that have less food available.

Improves the development of new materiales.La application of biotechnology... Continue reading "Advantages and disadvantages of biotechnology" »

POSITIONS OF PLACEMENT OF PATIENTS
Supine or dorsal
In the anatomical position, the patient remains with his hands on either side of the body, arms extended, adducted thumbs and hands of pronation.
The head is held erect and the feet pointing forward. The knees and fingers in slight flexion
The patient is lying on your back with legs extended, attached to the upper and lower body together.
Uses:
· Examination of the chest, abdomen, upper and lower limbs.
· Postoperative.
And Accommodation in bed
· Position change.
· Palpation of the breasts.
Contraindications:
· Elders.
· Lung disease.
Sick of long-term ·
Prone position or ventral


Also called prone. In this position the patient lies on his abdomen and chest, his head... Continue reading "Positions" »

Corn
Kingdom Plantae
Traqueofita Division
Angiosperm Class
Subclass Monocotyledoneae
Cereals Order
Family Poaceae (Gramineae)
Scientific name (genus and species) Zea mays

Bean

Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Subclass:	Rosidae
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Tribe:	Phaseoleae
Subtribe:

... Continue reading "Example of classification of animals: kingdom, family, class, order and scientific names" »

The Excretory System

The excretory system is responsible for eliminating waste substances from the body. The main organs involved are:

• The kidneys: They filter the blood and produce urine.
• The lungs: They eliminate carbon dioxide (CO2).
• The liver: It processes bilirubin (a product of red blood cell breakdown) and excretes it with the feces.
• The sweat glands: They produce sweat to regulate body temperature.

The Urinary System

The urinary system is a key part of the excretory system and is made up of:

• Ureters: Tubes that connect the kidneys to the bladder.
• Urinary bladder: A muscular organ that stores urine.
• Urethra: The tube through which urine leaves the body. In men, the urethra is shared by the urinary and reproductive systems, while in women it is

... Continue reading "How the Excretory System Filters Waste and Maintains Health" »

... Continue reading "Sexual Reproduction in Flowering Plants and Variation" »

Human Reproduction

1. Key Concepts in Reproduction

• (a) Ovulation is induced by: Luteinizing hormone (LH)
• (b) Acrosome of sperm is formed from: Golgi apparatus
• (c) Cessation of menstrual cycle in female is called: Menopause
• (d) Progesterone is secreted by: Corpus luteum
• (e) Connection between foetus and uterus: Placenta
• (f) Acrosome of sperm is formed from: Golgi body
• (g) Release of ovum from a mature follicle: Ovulation
• (h) Cells that nourish sperm: Sertoli cells
• (i) Genes located in Y chromosome: Holandric genes
• (j) Anterior part of sperm: Head
• (k) Germinal epithelium of gonads: Germ epithelium
• (l) Function of interstitial cells: Secretion of testosterone
• (m) Ovulation is induced by: Luteinizing hormone (LH)
• (n) Acrosomal vesicle contains: Hyaluronidase

... Continue reading "Human Reproduction: Key Concepts and Biological Processes" »

Alright, let’s make Cell Structure & Cell Theory feel alive—less textbook, more story 👇

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What is a Cell? The Mini City of Life

A cell is the tiniest unit of life—like a mini city that keeps everything running.
Your body isn’t one big thing; it’s a community of trillions of cells, each doing its own job but working together so you can breathe, think, move, and feel.

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The Three Fundamental Rules of Cell Theory

Cell theory is basically biology’s ground rules. Three simple but powerful ideas:

1. All Living Things Are Composed of Cells

From a tiny bacterium to a giant banyan tree to you—everything alive is built from cells.
Some organisms have one cell, others have millions or trillions, but no cell = no life.

2. The Cell Is the Basic

... Continue reading "Cell Structure and Cell Theory: The Building Blocks of Life" »

Homeostasis and Examples

Homeostasis is the ability of the body to maintain a stable internal environment despite changes in the external environment. Examples include: 1) body temperature regulation, 2) blood glucose regulation, 3) water balance, 4) blood pressure regulation, and 5) pH balance.

Branches: Anatomy and Physiology

Anatomy is the branch of science that deals with the study of the structure of different organisms and the human body.

Physiology is the branch of science that deals with the study of the functions of different organisms and the human body.

Cell and Tissue Structure and Function

Cell is the smallest structural and functional unit of the living body that carries out all vital physiological activities.

Tissue is a group of similar... Continue reading "Human Anatomy and Physiology Essentials: Homeostasis, Blood, Joints, Skin" »

Fundamentals of Biopsychology

1. Nature and Scope of Biopsychology

Biopsychology is the scientific study of the biological basis of behavior.

It is an interdisciplinary field that combines principles from psychology, biology, neuroscience, and medicine.

Key Focus Areas:

• Focuses on how the brain, hormones, and nervous system affect behavior and cognition.
• Applications include understanding mental disorders, learning, memory, and emotional responses.
• Example: Studying the stress response involves analyzing both hormonal (endocrine) and neural mechanisms.
• Relevance: Essential for clinical psychology, neurorehabilitation, and pharmacology.

2. Structure and Function of a Neuron

Neurons are the basic functional units of the nervous system.

Parts and Functions:

... Continue reading "Fundamentals of Biopsychology: Brain, Behavior, and Neural Systems" »