The circulatory system

Question 1

What are the roles of the circulatory system?

Answer 1

1. Transport gases, nutrients, waste materials throughout body
2. Regulate internal temperature and distribution of hormones
3. Protect body from diseases

Question 2

What are the 3 types of muscles?

Answer 2

Cardiac, smooth and skeletal

Question 3

Where is the Cardiac muscle located in our bodies?

Answer 3

The muscle is ONLY present in the heart

Question 4

What is the function of the Cardiac muscle and how it is controlled?

Answer 4

It contracts and releases as determined by the autonomic nervous system (involutionary)

Question 5

Where is the Smooth muscle located?

Answer 5

The smooth muscle is the surroundings of an organ such as the stomach and more

Question 6

Like the Cardiac muscle, the smooth muscle is also..

Answer 6

controlled by the autonomic nervous system

Question 7

Where is the Skeletal muscle located?

Answer 7

Unlike Cardiac and smooth, the muscle is attached to our bones

Question 8

Unlike Cardiac and Smooth, Skeletal muscle is controlled by..

Answer 8

it is under voluntary control

Question 9

In fast and slow twitch muscle fibres, type I fibre cause..

Answer 9

slow muscle twitch and is typically found in greater abundance in distance runners

Question 10

In fast and slow twitch muscle fibres, type II (Type II and IIx) fibres cause..

Answer 10

faster muscle twitch and is typically found in greater abundance in sprinters

Question 11

In fast and slow twitch muscle fibres, type I fibres break down ATP s..

Answer 11

slowly but is efficient to release energy

Question 12

In fast and slow twitch muscle fibres, Type II fibres break down ATP..

Answer 12

quickly but less efficient

Question 13

Explain how muscles contract

Answer 13

Muscles contract when a nerve impulse stimulates several muscle cells. Then the Actin and the Myosin combine causing muscle to shorten (contract).

Actin and myosin disengage when relaxing

Question 14

An electrocardiogram (ECG) is used for..

Answer 14

to record the electrical activity of the heart

Question 15

In a electrocardiogram..
P = ..
QRS = ..
T = ..

Answer 15

P = contraction of the Atria
QRS = contraction of ventricles
T = recovery of ventricles (Recovery of ventricle occurs at the same time as the recovery of the atria, therefore the recovery of atria cannot be detected)

Question 16

What is the mechanisms which signals the heart to beat?..

Answer 16

The sinoatrial node generates an electrical stimulus which causes atria to contract. During the contraction of the atria, it sends a message to the atrioventricular node (AV node) which then sends a signal to the bundle of his. It then sends a message to the purkinjie fibres which leads the contraction of the ventricles.