FreeNotes
Temperature regulation in the body is primarily managed by the hypothalamus in the brain. It detects changes in body temperature and triggers responses such as sweating to cool down the body or shivering to generate heat. Additionally, blood flow to the skin is adjusted to either retain or release heat, maintaining homeostasis. Related Questions: What … Read more
The respiratory and cardiovascular systems work together to supply oxygen to the body and remove carbon dioxide. The respiratory system brings oxygen into the lungs, where it diffuses into the bloodstream. The cardiovascular system then transports oxygenated blood to the tissues and returns deoxygenated blood back to the lungs to release carbon dioxide. Related Questions: … Read more
The stomach consists of several types of tissues working together: Epithelial tissue lines the stomach and secretes gastric juices, including digestive enzymes and hydrochloric acid. Muscular tissue allows the stomach to contract and churn food, aiding in digestion. Connective tissue supports and binds these tissues together. Nervous tissue regulates the muscular contractions and secretion of … Read more
(a) Organ and organelle: An organ is a collection of tissues working together to perform a specific function (e.g., heart, brain). An organelle is a subunit within a cell that performs a particular function (e.g., mitochondria, nucleus). (b) Animal and plant tissues: Animal tissues include epithelial, connective, muscular, and nervous tissues that perform various functions … Read more
The statement “Cells and are adapted to perform their function in the best way” refers to the idea that the structure of cells and tissues is specially designed to carry out specific functions effectively. The leaf, being a crucial part of the plant for photosynthesis and gas exchange, serves as a perfect example of how … Read more
Homeostasis refers to the ability of the body to maintain a stable internal environment despite changes in the external environment. Various organ systems work together to regulate body temperature, blood pressure, pH levels, and other vital functions. The nervous system detects changes in the internal environment (e.g., temperature, blood pressure) and sends signals to other … Read more
The human body has several organ systems, each with a specific function essential for maintaining life. These organ systems work together to ensure the proper functioning of the body. Circulatory system: The circulatory system is responsible for transporting blood, nutrients, gases (oxygen and carbon dioxide), and waste products throughout the body. It includes the heart, … Read more
The levels of biological organization represent the hierarchical arrangement of living organisms, from the simplest components to the most complex. These levels are: Molecular level: This is the most fundamental level, consisting of atoms and molecules. At this level, the basic building blocks of life, such as proteins, lipids, and nucleic acids (DNA and RNA), … Read more
Animal tissues are classified into four main categories based on their structure and function: epithelial tissue, connective tissue, muscular tissue, and nervous tissue. Each tissue type performs specialized functions within the body. Epithelial tissue covers the surfaces of the body and lines internal organs and cavities. It forms protective layers, such as the skin, and … Read more
Each of these cell types has a structure specifically designed to perform its function effectively. Root hairs are tiny, hair-like extensions of epidermal cells on the surface of roots. They significantly increase the surface area of the root, which allows for greater absorption of water and minerals from the soil. The elongated shape of root … Read more