lab lecture blood vessels

Students instructed to identify veins for group labeling from a provided list discussed in class.
Reminder to be present in the room by 05:25 on quiz days for timely conduct of the session.

Focus on understanding the anatomy and function of veins in relation to the heart.
Veins are responsible for returning blood to the heart, moving in the direction back towards the heart.
Importance of knowledge about veins due to contact with them in clinical environments.

Blood flows from various parts of the body through veins back towards the heart:
- Key concept: Veins direct blood towards the heart, while arteries direct blood away from it.

Introduction to the superior vena cava:
- Definition: Major vein carrying deoxygenated blood from the upper body to the heart.
Essential for students to understand its structure and location in relation to the heart.
Described as a point of venous return where deoxygenated blood enters the heart.

Blood Pressure in Arteries:
- Systolic pressure: 120 mmHg
- Diastolic pressure: 80 mmHg with a variation of ±5%.
- Hypertension: Systolic pressure above 130 mmHg;
- Hypotension: Systolic pressure below 115 mmHg.
Venous Pressure:
- Pressure in superior vena cava: 0-5 mmHg, can drop to 0 in dehydrated individuals.
- Discussion on the driving factors facilitating blood return to the heart:
- Muscle Contractions: Skeletal muscle contractions aid in pushing blood through veins.
- Valves: Prevent retrograde (backwards) flow of blood in medium-sized and larger veins.