Understanding the Human Heart
The Heart
The heart, a muscular organ roughly the size of a fist, pumps blood throughout the body via blood vessels. It’s located in the center of the chest, between the lungs.
Heart Walls and Chambers
The heart walls consist of myocardial muscle, responsible for involuntary contractions. The heart’s interior is divided into right and left halves, separated by a wall to prevent mixing. Each half contains two interconnected chambers: an upper atrium and a lower ventricle. The ventricles have thicker
Read MoreAnatomy of Major Arteries: Lower Limbs, Abdomen, and Head
Anatomy of Major Arteries
Scarpa’s Triangle
Scarpa’s triangle is formed by the vessels and nerves of the lower limbs, covered only by the fascia of the thigh, fat, and skin. It is a vulnerable area because the vessels and nerves are more superficial there.
Key Structures in Scarpa’s Triangle:
- Femoral artery
- Femoral vein
- Crural nerve
- Sartorius muscle
- Pectineus muscle
- Gracilis muscle
- Iliopsoas muscle
Lower Limb Arteries
The popliteal artery, tibial arteries, dorsalis pedis artery, plantar arteries, and collateral
Read MoreEmergency Care: Basic Life Support and Trauma
Basic Life Support
Basic Life Support: The set of measures that are intended to prevent cardiopulmonary arrest in emergency situations, if this has not occurred, or the maintenance of life or basic cardiopulmonary resuscitation (CPR) if it occurs.
Sequence in Basic CPR
- Ensure safety for the victim and the people that are attending.
- Assess the seriousness of the emergency situation.
- Assess the level of consciousness.
- Check for the existence of adequate ventilation.
- Assess blood circulation.
Hemorrhage
Hemorrhage:
Read MoreThe Interplay Between Endocrine and Nervous Systems
4 The Endocrine System
The endocrine or hormonal system is another system of coordination. This system is closely related to the nervous system and is dependent on each other. In some cases, the nervous system stimulates or inhibits the secretion of hormones, and in other cases, hormones stimulate or inhibit the action of the nervous system.
The endocrine system consists of a set of glands located throughout the body, called endocrine glands or glands of internal secretion, which empty their secretory
Mammals: Characteristics, Types, and Evolution
Mammals: Characteristics and Evolution
Mammals are the most evolved of all vertebrates. The majority live on land; their bodies are covered with hair or fur, and the females have glands on their chest, called mammary glands, which secrete milk when the animal gives birth to its young. Among non-land mammals are whales and dolphins, which live in the aquatic environment, and bats, which are flying mammals.
Mammals are homeothermic, or warm-blooded animals, so their body temperature stays fairly constant.
Read MoreEcology: Key Concepts and Definitions
Ecology: A Scientific Discipline
Ecology is the study of organisms in their environment and their relationship to each other.
Environmentalism: A Social and Political Movement
Environmentalism is distinct from ecology, representing a social and political movement.
Types of Interactions
- Intraspecific: Interactions within the same species. Example: mating behavior.
- Interspecific: Interactions with other species. Example: predation and mutualism.
Biotic and Abiotic Factors
- Biotic: Living components. Example: