Anatomy Lecture 2/9

Exam Average: Approximately 72, which is considered a C grade.
Homework Points: These contribute positively to overall grades, compensating for exam performance.
Student Feedback: Many students perceive this exam as challenging due to its extensive content.
Encouragement: Students struggling should utilize resources to prepare effectively.

PELLE (Peer Educational Learning Leaders) Sessions:
- Worksheets Availability: First worksheets cover initial topics in anatomy and physiology, serving as vital review material.
- Networking: PELLE sessions provide an opportunity to meet peers for collaboration.
- Structure of Sessions: Regular schedules planned to facilitate constant engagement with course material.
Tutoring Services:
- Requirement: Attendance at PELLE sessions is mandatory before obtaining a tutor.
- Office Hours: The instructor is available for individual consultations regarding exams and coursework.
- Scheduling: Office hours occur four days weekly, with specific days reserved for administrative duties.

Definition of Hemodynamics:
- Refers to the study of blood flow changes and blood pressure regulation in the body.
- Important concepts covered include blood flow alterations and blood pressure regulation.

Types of Blood Vessels:
1. Arteries: Carry blood away from the heart.
- Misconceptions addressed regarding color coding (red for arteries).
1. Arterioles: Smaller arteries that regulate blood flow to capillaries.
2. Capillaries: The site of exchange between blood and tissues (oxygen, nutrients, waste).
3. Venules: Small vessels where deoxygenated blood collects before returning to veins.
4. Veins: Carry blood back to the heart (clarification on direction of blood flow).

Nomenclature: Ensure to denote right/left along with artery or vein in all identifications.
Direction Awareness: Understand the flow direction to avoid confusion, especially with questions phrased in reverse.

Capillary Exchange Methods:
1. Diffusion:
- Process wherein substances move from areas of higher to lower concentration.
1. Transcytosis:
- Involves molecules being engulfed via vesicles, allowing for transport across endothelial cells.
1. Bulk Flow:
- Involves large quantities of fluid moving in response to pressure gradients.
  - Split into filtration (movement out) and reabsorption (movement inward).

Continuous Capillaries:
- Have tightly packed endothelial cells, limiting permeability. Found in the CNS and lungs.
Fenestrated Capillaries:
- Contain pores, allowing for increased exchange, commonly found in kidneys.
Sinusoidal Capillaries:
- Very leaky with large fenestrations, abundant in spleen and bone marrow for cell movement.

Role of Arteries:
- Function as pressure reservoirs due to elastic tissue, allowing stretching and recoil during cardiac cycles.
- Importance of elasticity highlighted with aging effects and implications for blood flow.

Precapillary Sphincters:
- Control entrance to capillary beds, impacting blood flow based on metabolic needs.
Vasoconstriction and Vasodilation:
- Vasoconstriction: Reduces lumen diameter, increases blood pressure, redirects blood flow.
- Vasodilation: Increases lumen diameter, decreases blood pressure, can redirect blood to specific tissues.

Aging and Elasticity: Decreased elasticity in blood vessels impacts blood flow regulation in the elderly, affecting activities and responses.
Clinical Relevance: EMTs should be aware of these dynamics, especially when dealing with elderly patients or those with vascular issues.

Recap of Main Topics: Blood vessel types, hemodynamic principles, capillary function, blood flow regulation.
Preparation Tips:
- Regular review of anatomical structures, participate actively in labs, engage with supplemental resources.