Over a million students use our free study notes to help them with their homework
The 3 types of blood vessels in the body are arteries, veins and capillaries. Arteries carry oxygenated blood away from the heart to the rest of the body. Arteries need to maintain a high blood pressure i...
The heart is divided into two halves - right and left. In each half there are two chambers - an atria and a ventricle, which are connected by a valve. The right atria receives deoxygenated blood from the ...
The muscle of the right ventricle contracts. This forces the {right atrio-ventricular/tricuspid} valve to close and the {right semi-lunar/pulmonary} valve to open. The blood is pumped through the pulmonar...
The P wave is caused by the contraction of the atria, forcing the blood into the ventricles. The sinoatrial node, produces a wave of depolarisation which causes the atria to contact and therefore the p w...
There are 3 factors that can influence the rate of photosynthesis: light intensity, carbon dioxide concentration and temperature. Light intensity influences photosynthesis as light is required during the ...
←
152
153
154
155
156
→
Internet Safety
Payment Security
Cyber
Essentials
Comprehensive K-12 personalized learning
Immersive learning for 25 languages
Trusted tutors for 300 subjects
35,000 worksheets, games, and lesson plans
Adaptive learning for English vocabulary
Fast and accurate language certification
Essential reference for synonyms and antonyms
Comprehensive resource for word definitions and usage
Spanish-English dictionary, translator, and learning resources
French-English dictionary, translator, and learning
Diccionario ingles-espanol, traductor y sitio de apremdizaje
Fun educational games for kids
