sci test

Vena cava

collects deoxygenated blood and transfers it to the right atrium so that it gets pumped up to the lungs

right atrium

transfers deoxygenated blood to the right ventricle

left atrium

receives oxygenated blood and gives it to the left ventricle

Left ventricle

pumps oxygenated blood to the rest of the body8

Avioli

microscopic air sacs that exchanges oxygen with carbon dioxide

trachea

rigid tube that directs airflow into the lungs

bronchi

large airway tubes that branch off the bottom of your windpipe (trachea) and carry air into your lungs

bronchioles

the smallest air passages in the lungs that branch off from the main airways

capillaries

thin walls enable exchange of gases, nutrients, and wastes with tissues.

veins

Blood vessels that carry deoxygenated blood back to the heart.

arteries

high‑pressure vessels carrying oxygen‑rich blood away from the heart.

MRS GREN

Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition.

nucleus

Membrane‑bound organelle containing DNA; directs cell activities.

Peristalsis

Wave‑like muscle contractions that move food through the digestive tract.

Diaphragm

Dome‑shaped muscle that contracts to draw air into the lungs.

Hemoglobin

Iron‑rich protein in red blood cells that binds oxygen for transport.

Villi

Finger‑like projections in the small intestine that increase surface area for absorption.

Excretion

expelling waste

Salivary amylase

starts starch digestion

Pepsin

enzyme that effectively digests protein

Cell wall

Plant cells

chloroplast

plant cells

Large central vacuole

plant cells

smaller vacuoles

animal cells

no cell walls

animal cells

lysomes

animal cells

How does the three systems connect to mrs gren

Nutrition (digestion) supplies glucose and other fuels.

2. How does the three systems connect to mrs gren

Respiration (lungs) provides Oxygen to oxidize those fuels, producing energy in mitochondria.

3. How does the three systems connect to mrs gren

Circulation exchanges cellular nutrients for wastes, sustaining excretion, growth, movement, and reproduction.