MEDICAL
HEART AND PERICARDIUM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Na
|
|
|
K
|
|
|
Cl
|
|
|
Proteins
|
Detailed explanation-1: -Your heart (cardiac) conduction system sends the signal to start a heartbeat. It also sends signals that tell different parts of your heart to relax and contract (squeeze). This process of contracting and relaxing controls blood flow through your heart and to the rest of your body.
Detailed explanation-2: -This electrical signal begins in the sinoatrial (SA) node, located at the top of the right atrium. The SA node is sometimes called the heart’s “natural pacemaker.” When an electrical impulse is released from this natural pacemaker, it causes the atria to contract.
Detailed explanation-3: -Simple diffusion does not require energy or need the assistance of a transport protein. Other larger or charged molecules that diffuse across a membrane may need assistance from a protein. Oxygen is a molecule that can freely diffuse across a cell membrane.