Login
Remember
Register
EasyElimu Questions and Answers
Questions
Unanswered
Tags
Users
Ask a Question
Ask a Question
Describe how the Heartbeat is controlled and maintained
0
votes
1.5k
views
asked
Nov 24, 2021
in
Biology Form 2
by
Dalgeon
Describe how the heartbeat is controlled and maintained
transport in plants and animals
Please
log in
or
register
to answer this question.
1
Answer
0
votes
answered
Dec 1, 2021
by
easyadmin
The heart is capable of contracting and relaxing rhythmically without fatigue due to its special muscles called cardiac muscles.
The rhythmic contraction of the heart arise from within the heart muscles without nervous stimulation.
The contraction is said to be myogenic.
The heartbeat is initiated by the pacemaker or sino-artrio-node (SAN) which is located in the right atrium.
The wave of excitation spreads over the walls of atria.
It is picked by the artrio-ventricular node which is located at the junction of the atria and ventricles, from where the purkinje tissue spreads the wave to the walls of the ventricles.
The heart contracts and relaxes rhythmically at an average rate of 72 times per minute.
The rate of the heartbeat is increased by the sympathetic nerve, while it is slowed down by the vagus nerve.
Heartbeat is also affected by hormones e.g. adrenaline raises the heartbeat.
Please
log in
or
register
to add a comment.
Related questions
0
votes
2
answers
describe how the heartbeat is controlled and maintained
asked
Dec 30, 2021
in
Biology Form 2
by
susanDama
transport in plants and animals
0
votes
7
answers
describe how a mammalian heart is adapted to its function
asked
Mar 16, 2023
in
Biology Form 2
by
0110290XXX
transport in plants and animals
0
votes
3
answers
Describe how water move from the soil to the leaves of a tree
asked
May 1, 2023
in
Biology Form 2
by
0768951XXX
transport in plants and animals
0
votes
2
answers
using irreverent example describe how an allergy reaction occurs in human beings answer please
asked
Oct 24, 2021
in
Biology Form 2
by
bichaberi
transport in plants and animals
0
votes
1
answer
Describe the Structure and Functions of Thrombocytes
asked
Nov 24, 2021
in
Biology Form 2
by
Dalgeon
transport in plants and animals
Welcome to EasyElimu Questions and Answers, where you can ask questions and receive answers from other members of the community.
Categories
All categories
Mathematics
(632)
English
(287)
Kiswahili
(559)
Chemistry
(663)
Physics
(604)
Biology
(659)
Biology Form 1
(263)
Biology Form 2
(192)
Biology Form 3
(157)
Biology Form 4
(47)
Geography
(537)
History
(568)
CRE
(365)
IRE
(53)
Agriculture
(519)
Business Studies
(379)
Computer Studies
(20)
Home Science
(60)
General Questions
(432)
6.4k
questions
9.6k
answers
6
comments
590
users
...