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

1. Biological Interaction

The interaction function enables organisms to receive changes and stimuli from their environment.

1.1 Stages of Interaction

The interaction function is divided into three stages: perception of stimuli, processing of information, and generation of a response.

• Stimulus: A physical or chemical change that affects the body.
• Receptors: Specialized cells that receive stimuli and transmit information.

Types of Receptors:

• Internal: Perceive changes inside the body.
• External: Perceive changes outside the body.
• Mechanoreceptors: Perceive mechanical stimuli.
• Thermoreceptors: Perceive changes in temperature.
• Nociceptors: Perceive pain.
• Photoreceptors: Perceive changes in light.

1.2 Coordination Centers

Coordination centers receive information... Continue reading "Biological Interaction: Perception, Coordination, and Senses" »

Understanding Key Human Muscles and Their Functions

Temporalis

• Origin: Along temporal lines of the skull.
• Insertion: Coronoid process of the mandible.
• Action: Elevates the mandible.

Masseter

• Origin: Zygomatic arch.
• Insertion: Ramus of the mandible.
• Action: Elevates the mandible and closes the jaw.

Sternocleidomastoid

• Origin: Attaches to the sternal end of the clavicle and manubrium.
• Insertion: Mastoid region and lateral nuchal line of the skull.
• Action: Flexes the neck.

Pectoralis major

• Origin: Cartilage of ribs 2-6, sternal body, and medial clavicle.
• Insertion: Greater tubercle and intertubercular groove of the humerus.
• Action: Flexion, adduction, and medial rotation at the shoulder.

Biceps brachii

• Origin: Coracoid process of the scapula.
• Insertion: Tuberosity

Eukaryotic Cell Organelles: Structure and Function

Cell Membrane

All cells are covered by the cell membrane. It supports and protects the cell, forming a barrier between the cell and its environment. It also controls the movement of materials into and out of the cell, helping to maintain homeostasis.

Cell Wall

The Cell Wall is found only in plant cells and is primarily made of cellulose. Its functions include:

• Providing structural support and protection.
• Allowing the diffusion of gases into and out of the cell.

The strength provided by the cell walls enables plants, such as trees, to stand tall and grow against gravity.

Nucleus

The Nucleus is a spherical, membrane-bound organelle. It directs most of the cell's activities and contains the cell's hereditary

Sintesis is called like that cause dna sts is taking place. Daughter cell trought mitsis=46. Cancer spend less time in interphase. Dna replication in interphase. Growth cell in g1. Cell g0= cerebral cortex. Most cells spend in interphase. Divide and dont die cancer. Function and decide typr of cell=differentation. Human sommatic= 46 crhomo  crossing over meiosis mix genes. Half crhomo=haploid. Full=diploid. No stem cell =gamete stem cell. Mult 100-150 cells embryonic stem cell. Tissues cells adult stem cell. Stem is medical because is undiferentiated. Sperm cells meiosis. Overall meiosis to make 4 unike haploid from a diploid. Meiosis only occurs in reproductive organs. Homozygous=pair. Observable traits=phenotype. Allele pairs=genotype. Crossing... Continue reading "Cell Biology, Genetics, and Evolutionary Theory Essentials" »

Essential Terminology in Human Anatomy and Physiology

Skeletal System and Musculature

• Scapula: A flat, triangular bone that forms the back of the shoulder.
• Tibia: The inner bone of the lower leg.
• Femur: A bone in the leg extending from the pelvis to the knee.
• Ulna: The bone in the forearm located on the side opposite the thumb.
• Radius: The bone in the forearm located on the side of the thumb.
• Humerus: The long bone in the arm running down from the shoulder to the elbow.
• Skull: The bones of the head, which surround the brain and give the head its shape.
• Pelvis: The bones below the abdomen that support the lower back and are connected to the bones of the leg.
• Hip: The joint and surrounding region connecting the leg to the trunk.
• Deltoid: A large muscle

The Fundamentals of a Balanced Diet

A balanced diet provides an adequate intake of energy and nutrients necessary for the maintenance of the body and overall good health. While a diet may be sufficient for normal bodily functioning, it may not necessarily be balanced. An ideal human diet contains fat, protein, carbohydrates, vitamins, minerals, water, and fiber in the correct proportions. These proportions vary for each individual based on metabolic rates and activity levels.

Understanding Malnutrition and Dietary Balance

Malnutrition results from an unbalanced diet, which can stem from an excess of certain dietary components or a lack of others, rather than just a complete lack of food. Consuming too much of one component can be as harmful as... Continue reading "Essential Principles of a Balanced Diet for Optimal Health" »

Tissues

Types of Tissues

• Epithelial Tissue: Covers the interior and exterior body surfaces.
• Connective Tissue: The most abundant type of tissue.
• Nervous Tissue: Transmits nerve impulses.
• Muscle Tissue: Provides movement.

Homeostasis

Homeostasis is the maintenance of a constant internal environment within an organism. One mechanism to achieve homeostasis is feedback inhibition, where a stimulus produces a response that opposes the original stimulus.

Nutrition

Macronutrients

• Carbohydrates: The major source of energy in the body.
• Fats: A combination of glycerol and fatty acids. They absorb fat-soluble vitamins, store energy, and protect body organs.
• Proteins: Molecules that supply raw materials for growth and repair.

Micronutrients

• Vitamins: Organic molecules

Head and Neck Anatomy: Quick Facts

1. Which muscle does the superficial cervical fascia contain? Platysma
2. Which part of the mandible is the stylomandibular ligament inserted? Angle and posterior border of ramus
3. What kind of secretion does the sublingual gland produce? Mixed, mainly mucous
4. What are the two anastomoses of the deep branch of the submental artery? Infra labial (facial) & mental artery (inferior alveolar)
5. Which nerve runs through the sphenopalatine foramen? Nasopalatine nerve
6. In which part of the brain is the hippocampus located? Limbic system
7. Which masticatory muscles do muscular branches of the facial artery supply? Medial pterygoid & masseter
8. What four cranial nerves (CNs) are related to the parasympathetic system? 3, 7, 9, 10
9. What

Respiratory System