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The textbook opens with this etymological insight: “The world communication has its origin in the Latin word COMMUNIS which stands for common or to create commonness with the people around you. This is possible when you share your feelings and ideas with others.” This etymology is foundational for communication theory because it reveals that communication is not merely transmission of a signal from A to B — it is the creation of shared meaning, shared understanding, and common ground. This is why models that treat communication purely as engineering (like the original Shannon-Weaver model) are inadequate for understanding human communication: they miss the essential element of commonness. The Schramm-Osgood model's concept of “field of experience” — the shared knowledge and cultural background that enables mutual understanding — is the direct theoretical expression of this etymological insight.
Cardiac Tamponade: Beck's Triad
- Hypotension — reduced cardiac output due to compression
- Muffled (distant) heart sounds — fluid surrounding the heart dampens sounds
- Jugular venous distension (JVD) — elevated venous pressure as blood cannot enter compressed heart
- Pulsus paradoxus \(> 10 \text{ mmHg}\): Exaggerated fall in systolic BP during inspiration
- Tachycardia (compensatory)
- Electrical alternans on ECG (alternating QRS amplitude)
- Enlarged cardiac silhouette on CXR ('water bottle' heart)
The four classic press theories are Authoritarian, Libertarian, Soviet/Communist, and Social Responsibility. The Authoritarian Theory predates democratic societies. Its key features include:
- Direct governmental control of all media
- No content that challenges the established political authority is permitted
- Media professionals have no independence within their organisations
- The state registers and licenses media outlets
- Punishments for questioning state ideology
This theory is “typical of pre-democratic societies where government consists of a very limited ruling class.” It is designed to protect the established social order. Option C describes the Soviet Theory; Option D describes the Social Responsibility Theory; Option A describes the Libertarian Theory.
- An oxidizing agent is itself reduced. In option A, the oxidation state of Oxygen in $H_{2}O_{2}$ changes from $-1$ to $-2$ (in $H_{2}O$).
- Since the oxidation state decreases, $H_{2}O_{2}$ is reduced, meaning it acted as an oxidizing agent for the Iodide ions ($I^{-}$ to $I_{2}$).
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