Master this deck with 22 terms through effective study methods.
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Metabolism and energy transformation at the cellular level are interrelated processes that support each other, ensuring the organism's survival, growth, and adaptation to the environment. Cells absorb necessary substances from the environment, perform anabolic and catabolic reactions to create matter and energy, and excrete waste products.
Plants primarily absorb water and ions through root hairs via passive mechanisms, particularly osmosis, driven by osmotic pressure differences. Aquatic plants can also absorb these substances through their surfaces, including roots, stems, and leaves.
Water enters root hairs through osmosis, a passive process where water moves from an area of higher concentration in the soil to an area of lower concentration inside the root cells, due to osmotic pressure differences.
The cardiac conduction system consists of the sinoatrial (SA) node, atrioventricular (AV) node, His bundle, and Purkinje fibers, which coordinate the heart's rhythmic contractions.
The SA node generates electrical impulses that spread through the atria, causing them to contract. The impulses then reach the AV node, travel down the His bundle, and spread through the Purkinje fibers, leading to ventricular contraction.
A cardiac cycle is one complete sequence of heart contraction and relaxation, consisting of three phases: atrial contraction, ventricular contraction, and general relaxation. In adults, it lasts about 0.8 seconds.
Heart rate is the number of cardiac cycles per minute and varies inversely with body mass across different animal species, with smaller animals generally having higher heart rates.
The circulatory system is composed of arteries, capillaries, and veins, which work together to transport blood throughout the body.
Blood pressure is the force exerted by circulating blood on the walls of blood vessels, measured in millimeters of mercury (mmHg) and typically expressed as systolic over diastolic pressure.
The stomach plays a crucial role in digestion by mechanically breaking down food and mixing it with gastric juices, which contain enzymes like pepsin and hydrochloric acid to chemically digest proteins.
A ruminant stomach consists of four chambers: the rumen (fermentation), reticulum (filtering), omasum (water absorption), and abomasum (true stomach for enzymatic digestion).
Clean food is essential for providing necessary nutrients without harmful substances, pathogens, or contaminants, ensuring safety and promoting overall health.
A balanced diet provides essential nutrients in appropriate proportions, supporting good health and preventing diseases. It should meet the body's nutritional needs and include a variety of foods.
Common digestive disorders include diarrhea, food poisoning, constipation, parasitic infections, and gastritis, often caused by pathogens, toxins in food, or poor dietary habits.
Respiration is the process by which animals take in oxygen from the environment for cellular respiration and release carbon dioxide, crucial for energy production and maintaining internal environmental balance.
The respiratory process includes ventilation (breathing), gas exchange in the lungs, and cellular respiration, where oxygen is used to produce energy and carbon dioxide is expelled.
The respiratory system maintains homeostasis by regulating oxygen and carbon dioxide levels in the blood, ensuring that cellular processes function optimally.
Factors affecting respiratory efficiency include the size and structure of the respiratory system, environmental conditions, physical activity levels, and overall health.
Different animals have evolved various adaptations for respiration, such as gills in fish for aquatic respiration, lungs in mammals for terrestrial respiration, and tracheal systems in insects.
During increased physical activity, the body responds by increasing the rate and depth of breathing to supply more oxygen to the muscles and remove excess carbon dioxide.
The diaphragm is a muscle that separates the thoracic cavity from the abdominal cavity and plays a key role in breathing by contracting to create negative pressure, allowing air to flow into the lungs.
Environmental factors such as altitude, temperature, and humidity can significantly influence respiration by affecting oxygen availability and the efficiency of gas exchange.