Living matter
Levels of organization
Cell structure and function
Plant cell.
This interactive map of plant and animal cells makes it easier to learn the different organelles. Click.
Comparison of Plant & Animal cells
Take a look inside the cell, here.
Nutrition
There are six main groups of foods included in the “Food pyramid”:
- group 1 – Milk and dairy products
- group 2 – Meat, fish and eggs
- group 3 – Fats and oils
- group 4 – Cereals, pulses, potatoes and sugar
- group 5 – Fruits
- group 6 – Vegetables
Research about this pyramid and answer the next questions:
- Can you give three examples of every group (dairy products …, meat…, fats…, fruits, …?
- What are nutrients?
- What do you think a healthy diet is?
Digestive apparatus
Organs that make up the digestive tract:
- Mouth
- Esophagus
- Stomach
- Small Intestine
- Large Intestine (colon)
- Rectum
- Anus
Organs that help with digestion but are not part of the digestive tract:
- Tongue
- Glands in the mouth that make saliva
- Pancreas
- Liver
- Gallbladder
*) An adult esophagus (also spelled esophagus and also called gullet) ranges from 10 to 14 inches in length, and 1 inch in diameter.
*) We make 1 to 3 pints of saliva a day.
*) Muscles contract in waves to move the food down the esophagus. This means that food would get to a person’s stomach, even if they were standing on their head.
*) It takes your mouth, esophagus, stomach, small intestine, large intestine, gallbladder, pancreas and liver just to digest a glass of milk.
*) An adults stomach can hold approximately 1.5 liters of material.
*) The stomach’s wall is lined with three layers of powerful muscles.
*) The average male will eat about 50 tons of food during his lifetime in order to sustain a weight of 150 pounds.
*) Within the colon, a typical person harbors more than 400 distinct species of bacteria.
*) On average, the stomach produces 2 liters of Hydrochloric Acid (HCl) daily.
*) After you eat, it takes usually between 24 and 72 hours in healthy adults for the complete process of digestion to occur.
*) The liver is the largest organ in the body.
*) In the mouth, food is either cooled or warmed to a more suitable temperature.
*) The liver performs more than 500 functions.
*) The small intestine (pronounced in-test-in) is a long tube about 1 and a half to 2 inches around, and about 22 feet long.
*) The large intestine is fatter than the small intestine at about 3 to 4 inches around, but shorter than the small intestine at about 5 feet long.
*) A full grown horse?? Their coiled up intestines are 89 feet long.
*) The digestive tract is like a long tube, approximately 30 feet long in total, through the middle of the body. It starts at the mouth, where food and drink enter the body, and finishes at the anus, where leftover food and wastes leave the body.
*) All the different varieties of food we eat are broken down by our digestive system and transported to every part of our body by our circulatory system.
*) Food stays in your stomach for 2 to 3 hours.
Respiratory system
Circulatory system
The Blood System
The 5 liters of blood of a 70 kg (154 lb) person constitute about 7% of the body’s total weight. The blood flows from the heart into arteries, then to capillaries, and returns to the heart through veins.
Blood is composed of 52–62% liquid plasma and 38–48% cells. The plasma is mostly water (91.5%) and acts as a solvent for transporting other materials (7% protein [consisting of albumins (54%), globulins (38%), fibrinogen (7%), and assorted other stuff (1%)] and 1.5% other stuff). Blood is slightly alkaline (pH = 7.40 ± .05) and a tad heavier than water (density = 1.057 ± .009).
All blood cells are manufactured by stem cells, which live mainly in the bone marrow, via a process called hematopoiesis. The stem cells produce hemocytoblasts that differentiate into the precursors for all the different types of blood cells. Hemocytoblasts mature into three types of blood cells: erythrocytes (red blood cells or RBCs), leukocytes (white blood cells or WBCs), and thrombocytes (platelets).
The leukocytes are further subdivided into granulocytes (containing large granules in the cytoplasm) and agranulocytes (without granules). The granulocytes consist of neutrophils (55–70%), eosinophils (1–3%), and basophils (0.5–1.0%). The agranulocytes are lymphocytes (consisting of B cells and T cells) and monocytes. Lymphocytes circulate in the blood and lymph systems, and make their home in the lymphoid organs.
The urinary system
To know more about it, please click here.
Test your knowledge, here.
Crosswords Respiration and Excreption.
Becky has sent us this video:
Please, ask five questions. The answers must be in this video.
Nervous System
If you are interested in comics, click here.
Becky has sent us this interesting link about endocrine system (Hormones activity).
Human anatomy: nervous system.
Endocrine system.
More about it
Now, you can do the exercises.
Sense Organs
The sens of hearing
How does vision work
Reproductive System
Health and Disease
esta bien la pagina pero la parte de ingles me cuesta entenderlo un poco!!!
holaaa seño!
somos alba romero,javier romero y marta luque hemos estado haciendo actividades del blog en la hora libre de física y química sobre las enfermedades,infecciones ,etc..
los ejercicios de inglés son mas difíciles
un besoo!;)
muy bien, eso mejorará el aprendizaje.
Teacher! I don´t find the video that we need to do the exercises of endocrine system from number six that you give us today in class .Kisses!