So our assumed little blood cell is passing through one of the vena cavas, it doesn't matter which one it passes through. This is because both of the vena cavas spill into one of the top chambers of the heart, known as the right atrium. The right atrium is a thin walled chamber, just a little smaller than a golf ball, and slightly larger than a ping pong ball. Interestingly, it is in the cells of the right atrium that the electrical signals are generated which control the heartbeat. When the right atrium contracts, it pushes the blood cells through a valve which leads to another chamber in the heart.
While the SNS directs the movements of the skeletal muscles, the ANS regulates involuntary processes such as the heart beating, breathing, blood pressure, and blood sugar level. When compared to other animals’ brains, the human brain is a more complex central nervous system. The reason for this is due to the proficiency of the human brain to continuously develop both in the structure and function of numerous cells in it as a responsive mechanism towards new incoming information, experiences, and even shock, which is also known as brain plasticity. (Sanders
Main tissues in the body There are four different types of tissue in the body, these are muscle, connective, nervous and epithelial; and for each type of tissue there are several sub-categories. In this essay I am going to describe the function of each type of tissue and the sub-categories. Muscle The muscle tissue has three different sub-categories which are striated, non-striated and cardiac. The muscle tissue is made up of muscle fibres, which can shorten, contracting and then returning to the pervious shape, which is known as relaxing. These movements cause the blood and other materials like urine, faeces and food, soft tissue and skeleton to move.
Compare and contrast the functions of each tissue type. Why do some areas of our body have stratified squamous epithelium and other areas have simple squamous epithelium? Epithelial tissues - It protects us, and it absorbs with the stomach and intestinal lining Connective tissues - Support, surround, connect other tissues, Protect organs, Transport fluids and dissolved materials Muscle tissues - Responsible for body movement, Moves blood, and food waste through body’s organs, Responsible for digestion. There are three types smooth, skeletal and cardiac muscle tissues. Nervous tissues - Conducts impulses organs from neurons.
The brain stem (midbrain pons and medulla oblongata) Controls involuntary reflex actions The cerebellum Maintains posture and co-ordinates movement. It received messages from the cerebrum and muscles and joints The diencephalon (includes the thalamus and hypothalamus Controls homeostatic mechanisms and the autonomic nervous system The cerebrum The largest part of the brain, divided into three areas that control movement, interpret sensory impulses and control of thought, memory, emotions and personality traits Nerves Nerves are compiled of neurons or nerve cells. These cells can vary in structure this depends on two different things: 1. Where they are 2. What they do But all cells have cell body’s containing the nucleus.
Again, it explains that the human muscles move in command from the brain. Single nerve cells in the spinal column called motor neurons form a long very thin extension of the single cell, called an axon. When an impulse travels down the axon to the muscle, a chemical is released at its ending. Muscles are made of long fibres connected to each other lengthways by a ratchet mechanism, that allows the two parts of an extension ladder to slide past each other,overlapping each other more, so that the muscles get shorter and fatter. When the impulses from the nerves stop, the muscle fibres slide back to their original position.
The heart contracts, pushing blood around the body. Blood flows away from the heart along the arteries, through capillaries (which are tiny blood vessels that are close to the body’s cells) at the organs and then back to the heart through the veins. As blood travels round the body through blood vessels it loses pressure, therefore the arteries have the highest pressure and veins have the lowest. Animals with gills e.g. fish have a single circulatory system, meaning one circuit of blood vessels from the heart.
Introduction: The human body has many cells and tissues. In this report, Epithelial Tissue will be examined for what it is, how they functions in a human body, and what role they do in the organs. Description: Epithelial Tissues are one of the four major tissues in a human body. There are many types of Epithelial Tissue; there is the Squamous, Cuboidal, Columnar, and the Glandular Epithelium. There are two main types of this tissue one is the simple epithelium and the other is the stratified epithelium.
1. Cardiovascular System is a complex network of the heart, blood vessels and blood. Its job is to deliver nutrients to the human body and remove excretory products from the body parts, it’s also protects the human body against infections, distribution of heat. At the centre of the cardiovascular system is the heart, a four chambered pump that dispenses blood to the arteries. The arteries carry nutrients and oxygenated blood to the body’s tissues.
Parts of the nervous and circulatory systems also play major roles in the digestive system. The large, hollow organs of the digestive tract contain a layer of muscle that enables their walls to move. The movement of organ walls can propel food and liquid through the system and also can mix the contents within each organ. Food moves from one organ to the next through muscle action called peristalsis. The first major muscle movement occurs when food or liquid is swallowed.