**Question:** A drug selectively blocks If channels in the heart. How would this change heart function?**Options:**- The amount of calcium entering the patient's heart cells would increase.- The drug would slow down this individual's heart rate.- This drug would decrease contractility of the patient's heart.- This drug would increase the blood pressure of the patient.**Explanation:** The question is exploring the effects of blocking If channels, which are also known as "funny channels." These channels play a crucial role in regulating heart rate by controlling the pacemaker activity in the sinoatrial node. Blocking these channels is expected to have specific effects on the heart's function.

There are different channels pr3sent in the heart which helps trasmjnt various currents .

A drug selectively blocks If channels in the heart. How would this change heart function? The amount of calcium entering the patient's heart cells would increase. The drug would slow down this individual's heart rate. This drug would decrease contractility of the patient's heart. This drug would increase the blood pressure of the patient.

A drug selectively blocks If channels in the heart. How would this change heart function? The amount of calcium entering the patient's heart cells would increase. The drug would slow down this individual's heart rate. This drug would decrease contractility of the patient's heart. This drug would increase the blood pressure of the patient.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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