Circulatory System
What organ pumps blood throughout the body?
Heart
What two organs are the main parts of the respiratory system that let you breathe?
Lungs (and trachea/bronchi as main airways)
What type of tissue lets your body move and holds posture?
Muscle tissue
What is the hard structure inside your body that supports and protects you?
Skeleton (bones)
Which organ stores and breaks down food with acids and muscles after you swallow?
Stomach
What are the blood vessels that carry blood away from the heart called?
Arteries
What is the tiny air sacs in the lungs where gas exchange happens?
Alveoli
What type of muscle is attached to bones and helps you move voluntarily?
Skeletal muscle
What is the name of the bone in the upper arm?
Humerus
What tube connects the mouth to the stomach?
Esophagus
Name two things that blood transports to body cells.
Oxygen, nutrients
What gas do we inhale and what gas do we exhale? (Two answers)
Inhale: Oxygen. Exhale: Carbon dioxide.
Give one example of a daily activity that uses skeletal muscles.
Examples: Walking, writing, lifting a backpack, jumping
What is the place called where two bones meet and allow movement?
Joint
Name two nutrients that the digestive system helps your body absorb.
Carbohydrates (glucose), proteins (amino acids), fats (fatty acids), vitamins, minerals
What part of the blood carries oxygen?
Red blood cells
Name one way the respiratory system helps the circulatory system.
The lungs add oxygen to blood, and oxygen travels in blood to cells.
How do muscles and bones work together to produce movement? (Short explanation)
When a muscle contracts it moves the bone, creating movement.
Name two functions of the skeletal system besides helping you move.
Examples: Protect organs (skull protects brain), store minerals (calcium), produce blood cells in bone marrow
What organ absorbs most nutrients into the bloodstream?
Small intestine
Explain one way the circulatory system and respiratory system work together to deliver oxygen to cells.
Lungs oxygenate the blood, and the heart pumps that oxygen-rich blood through arteries to body cells.
Describe how breathing rate changes during exercise and why.
Breathing rate increases during exercise to bring in more oxygen and remove more carbon dioxide because muscles need more oxygen for energy.
Explain why muscles need oxygen and nutrients during long exercise.
Muscles use oxygen and glucose to make energy. During long exercise they need increased blood flow to supply these.
Explain how the skeletal and circulatory systems work together to keep bones healthy.
Bone marrow in some bones makes blood cells, blood delivers nutrients and minerals (like calcium) to bones to keep them strong.
Describe how the digestive and circulatory systems work together to provide energy to cells.
The digestive system breaks food into nutrients, the circulatory system carries those nutrients in the blood to cells for energy and growth.