Question

explaining systems interactin
use your prior knowledge and information from the explain activities to answe

1. ccc systems and system models complete the table by explaining how

subsystems interacts to carry out functions necessary for life.
subsystems how they interact
circulatory and
respiratory
circulatory and
muscular
digestive and
circulatory
muscular and
respiratory
nervous and
digestive
digestive
excretory

Explanation:

• Circulatory and respiratory: The respiratory system takes in oxygen. The circulatory system then transports this oxygen to cells throughout the body. At the same time, the circulatory system picks up carbon dioxide from cells and brings it back to the respiratory system for exhalation.
• Circulatory and muscular: Muscles need oxygen and nutrients to function. The circulatory system delivers oxygen - rich blood (with nutrients) to muscles. When muscles contract (during movement), they help “pump” blood (especially in veins) to keep the circulatory process efficient. Also, during exercise, muscles demand more oxygen, and the circulatory system responds by increasing blood flow.
• Digestive and circulatory: The digestive system breaks down food into nutrients (like glucose, amino acids). These nutrients are absorbed in the small intestine. The circulatory system then picks up these absorbed nutrients and transports them to cells all over the body for energy production, growth, and repair.
• Muscular and respiratory: Muscles (like the diaphragm and intercostal muscles) are essential for breathing. The diaphragm contracts and relaxes to change the volume of the thoracic cavity, facilitating inhalation and exhalation. The intercostal muscles also assist in expanding and contracting the rib - cage, which is part of the respiratory process.
• Nervous and digestive: The nervous system controls the digestive process. The brain (central nervous system) can send signals (through the autonomic nervous system - parasympathetic and sympathetic) to regulate digestion. For example, the parasympathetic nervous system stimulates digestive processes (like increasing saliva production, promoting peristalsis), while the sympathetic nervous system can slow down digestion in a “fight - or - flight” response.
• Digestive and excretory: The digestive system processes food. The excretory system (including the kidneys) filters waste products (like urea, excess salts) from the blood. Some waste from digestion (like indigestible fiber and dead cells) is excreted as feces. Also, the liver (which has a role in digestion - processing nutrients) works with the excretory system (as the liver detoxifies substances that the kidneys then excrete).

Answer:

• Circulatory and respiratory: Respiratory provides oxygen, circulatory transports it; circulatory brings back CO₂ for exhalation.
• Circulatory and muscular: Circulatory supplies muscles with O₂ and nutrients; muscles aid blood flow.
• Digestive and circulatory: Digestive breaks food to nutrients, circulatory transports them.
• Muscular and respiratory: Muscles (diaphragm, intercostal) enable breathing movements.
• Nervous and digestive: Nervous system regulates digestive processes (e.g., parasympathetic/sympathetic control).
• Digestive and excretory: Digestive processes food, excretory filters and excretes waste (including some from digestion).