What is a cell?
The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.
Differences of Animal and Plant Cells
Animal cells do not have a cell wall or chloroplasts but plant cells do.
Functions of 3 cells
1. Muscle- Muscle contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles Function to produce force and motion.
2. Nerve- Your nervous system contains millions of nerve cells, called neurons. Neurons are highly specialised to transmit messages from one part of your body to another.
3. Bone- One function of the osteocyte might be the remodeling of the bone through growths of new arms on the cell. It is also known that osteocytes can secrete growth factors which activate lining cells or stimulate osteoblasts.
Relationship between Tissues
The eye contains muscle cells that open and close the pupil, clear cells that make up the lens and cornea, cells that produce the fluid within the eye, cells that sense light, and nerve cells that conduct impulses to the brain.
Components and Functions of the Digestive System
- Food passes through a long tube inside the body known as the alimentary canal or the gastrointestinal tract (GI Tract). The alimentary canal is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines.
- Also known as the cardiovascular system, your heart, blood vessels and blood itself are three essential components the body needs to survive. The circulatory system consists of two circuits that blood travels through; pulmonary and systemic.
- The respiratory system provides oxygen to the body’s cells while removing carbon dioxide, a waste product that can be lethal if allowed to accumulate. There are 3 major parts of the respiratory system: the airway, the lungs, and the muscles of respiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles, carries air between the lungs and the body’s exterior.
Paramecium Compared to Other Cells
The paramecium is an animal cell but it looks like all other cells. It is microscopic and has cytoplasm. It also has vacuoles meaning it is a plant cell.