Notes, summaries, assignments, exams, and exercises for Biology for Other courses

Skeletal Joints: Structure and Classification

Joints: These structures, also known as articulations or knuckles, consist of tissues that unite different parts of the skeleton. More technically, a joint is defined as the set of hard and soft parts that constitute the union of two or more contiguous bones.

Joints can be classified into two large categories based on:

• Structure (morphology).
• Function (physiology).

Morphological Joint Types

Morphologically, different types of joints are classified according to the connecting tissue into several categories:

• Fibrous joints
• Cartilaginous joints
• Synovial joints (Diarthroses)

Physiological Joint Types

Physiologically, the human body features several joint types:

• Synarthrosis: Immobile joints.
• Symphysis: Joints allowing

Body Types can be graded on three components:

• Endomorphy: Refers to the predominance of curves and visceral development.
• Mesomorphy: Refers to the predominance of muscle and bone. Subjects are relatively strong.
• Ectomorphy: Highlights the prevalence of poor muscle development, resulting in greater fragility. Subjects typically have long and thin limbs.

In relation to the question of heritage concerning body type, there seems to be a consensus to accept its inherited character, manifesting at an early age.

The Growth of Different Body Systems

Nervous System

The nervous system shows growth and maturity very quickly. It is likely that after 7 months of age, nerve cell formation has not yet completed; however, there seems to be a predetermined sequence...

The Endocrine System and Glands

The endocrine system consists of a series of organs and glands responsible for producing and releasing chemical substances (hormones) into the bloodstream or outside the body.

Types of Glands

• Exocrine Glands (Duct Glands): Produce substances that are released outside the body through ducts.

  Examples: Sudoriferous (sweat) glands, lacrimal glands, salivary glands, and mammary glands.

• Endocrine Glands (Ductless Glands): Produce hormones that are poured directly into the blood.

  Example: The pituitary gland (Hypophysis).

• Mixed Glands: Act as both endocrine and exocrine glands.

  Examples: The pancreas and sexual glands.

What Are Hormones?

Hormones are chemical substances that regulate body activities such as growth and the concentration...

Basic Development Models

Protostomes

Protostomes: In protostomes, which translates to "mouth first", the mouth of the new individual develops separately from the blastopore, the first opening of the embryo.

Deuterostomes

Deuterostomes: In deuterostomes, which translates to "mouth second", the mouth opens later in a different place than the blastopore.

Extraembryonic Membranes

Extraembryonic membranes originate from the embryo but are not part of it. They form with input from all embryonic layers and play important roles in development:

• Yolk Sac: The first embryonic membrane that forms. It surrounds the mass of yolk, where one exists.
• Amnion: A membrane surrounding the embryo that secretes amniotic fluid, providing an aqueous environment.
• Chorion: Surrounds

Review of Photosynthesis Fundamentals

Which coenzyme is necessary for non-cyclic photophosphorylation?

NADP⁺

What happens to the light energy absorbed by antenna pigments?

It transfers to other pigments in the form of excitation energy.

Which organisms possess chloroplasts?

Algae and plants.

What is the electron donor that replaces the electron lost by Chlorophyll P680?

Water.

What provides the electron that replaces the electron lost by Chlorophyll P700?

The plastocyanin.

What molecule fixes CO₂ in the Calvin cycle?

Ribulose-1,5-bisphosphate carboxylase (RuBisCO).

What is the first stable compound that appears in the Calvin cycle after CO₂ fixation?

3-Phosphoglyceric acid.

Which statement describes a characteristic of chemosynthesis?

It is performed only

Renal System Functions and Mechanisms

The renal system functions to regulate the balance of the internal environment, ensuring both the excretion of metabolites and the retention of necessary anabolites (ions). The kidney performs its functions through various mechanisms, which include:

• Glomerular filtration
• Tubular reabsorption
• Secretion
• Excretion via urine

The Nephron: Morphofunctional Unit

The morphofunctional unit of the kidney is the nephron, which consists of a glomerulus and a tubule system. This system includes the proximal tubule, the loop of Henle, and the distal tubule, which empties into collecting ducts. The fluid that exits these ducts is urine.

Nephron Types and Distribution

Filtration occurs in the glomerulus, while reabsorption and...

Desenvolvemento Embrionario Inicial

Implantación e Primeiras Etapas

A implantación no endometrio ocorre de forma temperá. Unha vez implantado, o embrión continúa crecendo e desenvolvéndose.

Formación do Sistema Nervioso e Órganos

Prodúcese a formación inicial do sistema nervioso. Arredor dos tres meses, o embrión convértese nun feto e os seus órganos comezan a funcionar.

Reprodución Humana Asistida: Técnicas

Inseminación Artificial

A inseminación artificial consiste en introducir artificialmente o esperma no tracto reprodutor feminino.

Fecundación In Vitro (FIV)

A fecundación in vitro (FIV) consiste en fecundar o óvulo co esperma fóra do corpo, no laboratorio. O termo in vitro fai referencia ao uso de material de laboratorio, como...

Nucleotide Excision Repair

Nucleotide excision repair involves an enzyme complex that hydrolyzes phosphodiester bonds on one side of the distortion caused by the lesion. The damaged oligonucleotide is removed through the incisions, and the resulting gap is filled by DNA polymerase I in E. coli and by DNA polymerase ε in eukaryotes. The nick is then sealed by DNA ligase.

A protein complex formed by UvrA and UvrB scans DNA and binds to the site of the lesion. After the UvrA dimer dissociates, UvrB remains anchored to the strand. UvrC then binds to UvrB and makes the cuts in the phosphodiester backbone required. The excised fragment is removed by a helicase, and the gap is filled by DNA polymerase I and sealed by DNA ligase.

Various types of lesions...

Uric Acid Stones: Causes, Treatment, and Diet

Uric acid stones are associated with the production of acidic urine.

Treatment for Uric Acid Stones

• Increase fluid intake.
• Increase urine pH to 6.0-6.5.
• Adopt a diet rich in alkaline-forming foods, supplemented with citrate or bicarbonate.

Dietary Considerations for Uric Acid Stones

Acid-Forming Foods (Potentially Acidic Residue)

• Meat: Beef, fish, game, seafood.
• Dairy: Eggs, cheese.
• Fats: Bacon, walnuts, Brazil nuts, hazelnuts.
• Grains & Baked Goods: Flour, bread (especially whole wheat), cereal, biscuits, pasta, rice, cakes.
• Vegetables: Corn, lentils.
• Fruits: Blueberries, plums.

Alkaline-Forming Foods (Potentially Basic Residue)

• Dairy: Milk and milk products, cream, whey.
• Fats: Almonds, chestnuts, coconut.
• Vegetables:

Advanced Medical Imaging Techniques

• Computed Tomography (CT) Scans

  Computed Tomography (CT) allows for the visualization of body parts in very fine, successive cross-sections, revealing even the smallest details. The apparatus uses an X-ray tube and detectors that analyze the fraction of X-rays absorbed by tissues. Soft tissues absorb less radiation than hard tissues, allowing for differentiation.

• Magnetic Resonance Imaging (MRI)

  Magnetic Resonance Imaging (MRI) uses a powerful magnet to generate a magnetic field, which is absorbed by hydrogen atoms in the body. By changing the magnetic field, these atoms return to their original state, emitting signals that are detected and computed by a computer to generate detailed images. MRI can produce images