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

Human Reproduction & Sexuality

Human reproduction is sexual and has two key characteristics:

• The new individual is formed from a single cell called a zygote.
• Zygotes result from the union of two gametes (fertilization).

Humans have two types of gametes: sperm (men) and ova (women).

Changes During Reproductive Life

During the reproductive life of a human being, there are three main stages:

• Puberty

  Puberty begins in men with the first ejaculation (spermarche) and in women with the first menstruation (menarche). This is due to the increased secretion of pituitary hormones: Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH), which stimulate gamete production.

  Puberty typically begins when girls are 10-13 years old and boys 12-14. It lasts

Fundamental Biological Energy Processes

Photosynthesis and Cellular Respiration: Key Equations

• Photosynthesis: Converts light energy into chemical energy (glucose).

  6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

• Cellular Respiration: Breaks down glucose to release energy (ATP).

  C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

Purpose and Scope of Energy Conversion

Photosynthesis allows plants and algae to make their food by converting light energy from the sun into chemical energy stored in glucose.

Cellular Respiration is the process used to generate usable energy, primarily in the form of Adenosine Triphosphate (ATP). ATP is the energy currency of the cell, essential for carrying out all cellular functions.

Organisms Performing These Processes

• Photosynthesis

DNA Mutations

Mutations are alterations to a DNA sequence that occur when a gene is damaged or changed, altering the genetic message. These mutations can have varying effects on health, depending on their location and whether they alter essential protein functions.

Mutations can occur at three levels:

1. Molecular (Gene or Point)
   • These mutations affect the chemical constitution of genes, specifically the DNA bases.
2. Chromosomal
   • These mutations affect a segment of a chromosome, altering its structure through deletions, duplications, or rearrangements.
3. Genomic
   • These mutations affect the entire genome, altering the number of chromosome sets (polyploidy or haploidy) or individual chromosomes (e.g., trisomy 21).

Mutations can be of different types:

1. Gene Mutations:

Cell Membrane Structure and Function

Question: What is the role of organic molecules in the cell membrane?

Answer: Organic molecules contribute to cell–cell adhesion and protect the cell surface from chemical damage.

How Are Substances Transported Across the Membrane?

There are three main types of membrane transport:

• Passive transport — a type of membrane transport that does not require energy to move substances across cell membranes. Passive transport can use diffusion or osmosis and depends on the concentration gradient.
• Facilitated transport — molecules are transported across the plasma membrane with the help of membrane proteins (examples in common descriptions include oxygen, CO2, and glucose).
• Active transport — uses different protein

Digestive Phases

Cephalic Phase

The cephalic phase initiates digestion before food even reaches the stomach. Sensory cues like taste, smell, or even the thought of food trigger the central nervous system to stimulate gastric juice production.

Gastric Phase

Once food enters the stomach, receptors signal the brain, which in turn promotes further gastric juice secretion to break down the ingested food.

Intestinal Phase

As food moves into the duodenum, receptors detect its presence and signal the brain to increase the production of digestive juices for further processing.

Enterogastric Reflex

When the duodenum is full, the enterogastric reflex is activated, causing the pyloric sphincter to close and regulate the passage of chyme from the stomach to the... Continue reading "Digestive System Processes: A Comprehensive Guide" »

Lower First Premolar

Prominent Elevations & Depressions/Snake-Snail Eye Lingually

Chronology

• Enamel: 5-6 years old
• Eruption: 10-11 years old
• Root: 12-13 years old

Geometry

• Lingual/Buccal: Trapezoid; short side cervical
• Mesio-Distal: Rhomboidal
• Occlusal: Diamond

Buccally

• Cervical Ridge
• Buccal Ridge
• Mesio-Distal Buccal Developmental Groove

Lingually

• Mesio-lingual Developmental Groove

Mesially

• Mesio-lingual Developmental Groove

Mesial Contact Area

• Junction between buccal and middle thirds

Distal Contact Area

• Middle third

Occlusally

• 2 well-developed cusps
• Each cusp: triangular ridge
• Mesial/Distal Marginal Ridges
• Triangular Fossae
• Developmental Pits
• Central Developmental Groove
• Transverse Ridge
• Mesio-lingual Developmental Groove

Lower Second Premolar

3-Cusp Type has 5 Lobes

The Sense of Hearing and Balance

The sense of hearing is located inside the ears. Sounds are vibrations of the air, received by the eardrum. The eardrum transfers these vibrations to the cochlea, where mechanoreceptors transform them into nerve impulses. These impulses then travel to the brain through the auditory nerve. The sense of balance is also located inside the ear and is closely related to the sense of hearing.

The Organization of the Nervous System

The nervous system is composed of two main divisions: the Central Nervous System (CNS) and the Peripheral Nervous System (PNS).

Central Nervous System (CNS)

• The Central Nervous System (CNS) comprises the brain and the spinal cord. This is where all stimuli are evaluated, and responses are generated.

Health and the Immune System

The World Health Organization (WHO) defines health as a state of complete physical, mental, and social well-being, not merely the absence of disease.

Components of Health

• Physical health: Body systems functioning properly.
• Mental health: Maintaining emotional and psychological balance.
• Social well-being: Fulfillment of basic human needs, including peace, food, education, a decent wage, and social justice.

Note: Any change in the body that results in a loss of health is considered a disease.

Key Medical Terminology

• Aetiology: The study of the causes of a disease.
• Symptoms: Subjective evidence of disease perceived by the patient (e.g., pain, fatigue, sadness, loss of appetite).
• Signs: Objective evidence of disease observed

ACTIVITIES

Trasplant: is a surgical procedure in which diseased or injured organs, tissues, cells are replaced with healthy one from a donor.

|The donor can be another person, the same person or an animal|

Types of transplant:

-Autotrasplant: the recipient and donor are the same person

-Allogeneic transplant:  the donor is another person

-Xenotrasplant: the donor is an animal

Organ donation: is voluntary. Donors must be in good health, free from mental health problems, of legal age, not receive money in exchange for their organs, and give written consent

Types of donation:

-Cells:... Continue reading "A body is placed in a certain airstream" »

The Lymphatic System

The lymphatic system is a network of vessels and structures distributed throughout the body.

• Lymph capillaries: They collect excess interstitial fluid.
• Lymphatic vessels: They return excess lymph to the circulatory system.
• Lymph nodes: They contain defense cells that locate and fight microorganisms that could cause infection.

Composition and Function of Blood

Blood is a thick red liquid that flows inside the blood vessels.

• Blood plasma: A yellowish liquid that makes up 55% of blood.
• Blood cells: Red blood cells, white blood cells, and platelets make up the remaining 45% of blood.
• White blood cells (leukocytes): Protect the body against infection and foreign substances.
• Red blood cells (erythrocytes): Transport oxygen and pick up